Late transition metal catalysts for olefin polymerization and oligomerization

ABSTRACT

This invention relates to a transition metal compound represented by the formula LMX wherein M is a Group 3 to 11 metal L is a bulky bidentate or tridentate neutral ligand that is bonded to M by two or three heteroatoms and at least one heteroatom is nitrogen; X is a substituted or unsubstituted catecholate ligand provided that the substituted catecholate ligand does not contain a 1,2-diketone functionality.

FIELD

A series of novel late transition metal catalysts for olefin polymerization have been invented. The Group 10 transition metal species are characterized by their typical pseudo-square planar geometry and diamagnetism. These late transition metal catalysts demonstrate high activity for a-olefin polymerization.

BACKGROUND

Early transition metal catalysts useful for olefin coordination polymerization include the traditional Ziegler-type catalysts based on Group-4-5 transition metals and the newer metallocene type catalysts based on Group-4-6 transition metals. But specific late transition metal catalysts suitable for olefin polymerization have not offered the same levels of activity or molecular weight capability for olefin polymerization. Further development of these catalyst systems has been attempted addressing these shortcomings.

Ancillary-ligand-stabilized metal complexes (e.g., organometallic complexes) are typically useful as catalysts, additives, stoichiometric reagents, monomers, solid state precursors, therapeutic reagents, and drugs. The ancillary ligand system generally comprises organic substituents that connect to and remain associated with the metal centers. These interactions provide an opportunity to modify the organometallic complexes' shape and their electronic and chemical properties.

Certain organometallic complexes are catalysts for reactions such as oxidation, reduction, hydrogenation, hydrosilation, hydrocyanation, hydroformylation, polymerization, carbonylation, isomerization, metathesis, carbon-hydrogen activation, cross-coupling, Friedel-Crafts acylation and alkylation, hydration, dimerization, trimerization, oligomerization, Diels-Alder reactions, and other transformations. Typical complex synthesis proceeds by combining an ancillary ligand precursor with a metal-containing precursor in a solvent at a temperature. For example, organometallic complexes can be single-site, olefin polymerization catalysts. Their active sites typically comprise an ancillary-ligand-stabilized, coordinatively unsaturated transition-metal-alkyl complex.

In Johnson, Killian, and Brookhart, J. Am. Chem. Soc., 1995, 117, 6414, the authors describe the use of Ni and Pd complexes for ethylene, propylene, and 1-hexene homopolymerization. The catalyst precursors are square-planar, M²⁺, d⁸, 16-electron complexes incorporating substituted, bidentate diimine ligands. Either methyl or bromide ligands occupy the active coordination sites. These polymerizations used H⁺(OEt₂)₂[B(3,5-(CF₃)₂C₆H₃)₄]⁻ to activate methyl ligand complexes and methylalumoxane (MAO) or diethyl aluminum chloride to activate bromide ligand complexes.

European Patent publication EP-A2-0 454 231 describes Group-8, -9, and -10 metal catalysts as being suitable for ethylene, α-olefin, diolefin, functionalized olefin, and alkyne polymerizations. The catalyst precursors are Group-8, -9, and -10 metal compounds that are activated by cocatalysts including discrete borate anions. This paper also illustrates ethylene homopolymerization in solutions of methylene chloride, toluene and diethyl ether. Few polymerizations were conducted in the presence of a support material, and broad molecular weight distribution polymers were produced.

WO 97/48736 describes supported late transition metal catalysts based on diimine nickel dihalide compounds where the transition metal complex was preactivated with an aluminate.

PACT publication WO 99/05154 relates to a variety of pnictide-based ligands and their uses for catalyst systems. In particular, it discloses metal compositions and compounds stabilized by an ancillary chelating ligand structure, that polymerize functionalized and non-functionalized monomers, either alone or with an activator.

Other references of interest include U.S. Pat. No. 6,586,358 B2, V. C. Gibson and S. K. Spitzmesser, Chem. Rev., 2003, 103, 283, and S. D. Ittel, L. K. Johnson, and M. Brookhart, Chem. Rev., 2000, 100, 1169.

With the discoveries of Brookhart and others, a new area of focus in polymerization catalysis now focuses on late transition metal chemistry. These types of catalyst precursors are typically nickel, cobalt or iron dihalide compounds complexed with bidentate or tridentate chelating ligands. These types of nickel catalyst precursors are typically only slightly soluble in commonplace polymerization solvents. The nickel complexes are also typically paramagnetic complexes that are difficult to characterize and purify. Depending on the oxidation state of the cobalt and iron complexes, they too can be paramagnetic. When complexes are paramagnetic, typically IR, elemental analysis and x-ray crystallography characterization is useful, however, these techniques can also be limiting. For example, for x-ray crystallography, growing crystals of fairly insoluble compounds can often be difficult. Elemental analysis requires a pure compound, again something often difficult to obtain with a poorly soluble compound because purification techniques are more limited. And while IR is a good characterization tool when used in combination with other characterization techniques, it also has its limitations—in particular, identifying and quantifying small amounts of impurities in a product. Thus, the need exists for more easily characterized and more soluble catalyst precursors that nonetheless retain or exceed the catalytic activity of prior art catalysts.

SUMMARY

The polymerization catalysts of this invention can be derived from the transition metal compounds (also called precatalysts or catalyst precursors) of formula: LMX wherein M is a Group 3 to 11 metal, preferably a Group 8, 9, 10 or 11 metal; L is a bulky bidentate or tridentate neutral ligand that is bonded to M by two or three heteroatoms and at least one heteroatom is nitrogen; X is a substituted or unsubstituted catecholate ligand provided that the substituted catecholate ligand does not contain a 1,2-diketone functionality.

Preferred transition metal compounds are typically complexes stabilized in a pseudo square planar geometry that provides a diamagnetic complex that can be readily characterized by NMR spectroscopy. Furthermore, in this geometry, the catalyst precursor is more soluble in common organic solvents.

This invention further relates to a process to oligomerize and/or polymerize unsaturated monomers using the above transition metal compounds combined with an activator.

DEFINITIONS

As used herein, the numbering scheme for the Periodic Table Groups is used as in CHEMICAL AND ENGINEERING NEWS, 63(5), 27 (1985).

The terms “hydrocarbyl radical,” “hydrocarbyl” and hydrocarbyl group” are used interchangeably throughout this document. Likewise the terms “group” and “substituent” are also used interchangeably in this document. For purposes of this disclosure, “hydrocarbyl radical” is defined to be C₁-C₁₀₀ radicals, that may be linear, branched, or cyclic, and when cyclic, aromatic or non-aromatic, and include substituted hydrocarbyl radicals, halocarbyl radicals, and substituted halocarbyl radicals, silylcarbyl radicals, and germylcarbyl radicals as these terms are defined below.

Substituted hydrocarbyl radicals are radicals in which at least one hydrogen atom has been substituted with at least one functional group such as NR⁵ ₂, OR⁵, SeR⁵, TeR⁵, PR⁵ ₂, AsR⁵ ₂, SbR⁵ ₂, SR⁵, BR⁵ ₂, SiR⁵ ₃, GeR⁵ ₃, SnR⁵ ₃, PbR⁵ ₃ and the like or where at least one non-hydrocarbon atom or group has been inserted within the hydrocarbyl radical, such as O, S, Se, Te, NR⁵, PR⁵, AsR⁵, SbR⁵, BR⁵, SiR⁵ ₂, GeR⁵ ₂, SnR⁵ ₂, PbR⁵ ₂ and the like, where R⁵ is independently a hydrocarbyl or halocarbyl radical. In some embodiments of the invention, a substituted hydrocarbyl excludes substitutions with trihydrocarbylsiloxy substituents, e.g.—OSiR⁵ ₃.

Halocarbyl radicals are radicals in which one or more hydrocarbyl hydrogen atoms have been substituted with at least one halogen (e.g. F, Cl, Br, I) or halogen-containing group (e.g. CF₃).

Substituted halocarbyl radicals are radicals in which at least one halocarbyl hydrogen or halogen atom has been substituted with at least one functional group such as NR⁵ ₂, OR⁵, SeR⁵, TeR⁵, PR⁵ ₂, AsR⁵ ₂, SbR⁵ ₂, SR⁵, BR⁵ ₂, SiR⁵ ₃, GeR⁵ ₃, SnR⁵ ₃, PbR⁵ ₃ and the like or where at least one non-carbon atom or group has been inserted within the halocarbyl radical such as O, S, Se, Te, NR⁵, PR⁵, AsR⁵, SbR⁵, BR⁵, SiR⁵ ₂, GeR⁵ ₂, SnR⁵ ₂, PbR⁵ ₂ and the like where R⁵ is independently a hydrocarbyl or halocarbyl radical provided that at least one halogen atom remains on the original halocarbyl radical.

Silylcarbyl radicals ( also called silylcarbyls) are groups in which the silyl functionality is bonded directly to the indicated atom or atoms. Examples include SiH₃, SiH₂R⁵, SiHR⁵ ₂, SiR⁵ ₃, SiH₂(OR⁵), SiH(OR⁵)₂, Si(OR⁵)₃, SiH₂(NR⁵ ₂), SiH(NR⁵ ₂ ₂, Si(NR⁵ ₂)₃, and the like where R⁵ is independently a hydrocarbyl or halocarbyl radical as defined above and two or more R⁵ may join together to form a substituted or unsubstituted saturated, partially unsaturated or aromatic cyclic or polycyclic ring structure. Germylcarbyl radicals (also called germylcarbyls) are groups in which the germyl functionality is bonded directly to the indicated atom or atoms. Examples include GeH₃, GeH₂R⁵, GeHR⁵ ₂, GeR⁵ ₃, GeH₂(OR⁵), GeH(OR⁵)₂, Ge(OR⁵)₃, GeH₂(NR⁵ ₂), GeH(NR⁵ ₂ ₂, Ge(NR⁵ ₂)₃, and the like where R⁵ is independently a hydrocarbyl or halocarbyl radical as defined above and two or more R⁵ may join together to form a substituted or unsubstituted saturated, partially unsaturated or aromatic cyclic or polycyclic ring structure.

Polar radicals or polar groups are groups in which the heteroatom functionality is bonded directly to the indicated atom or atoms. They include heteroatoms of groups 1-17 of the periodic table either alone or connected to other elements by covalent or other interactions such as ionic, van der Waals forces, or hydrogen bonding. Examples of functional groups include carboxylic acid, acid halide, carboxylic ester, carboxylic salt, carboxylic anhydride, aldehyde and their chalcogen (Group 14) analogues, alcohol and phenol, ether, peroxide and hydroperoxide, carboxylic amide, hydrazide and imide, amidine and other nitrogen analogues of amides, nitrile, amine and imine, azo, nitro, other nitrogen compounds, sulfur acids, selenium acids, thiols, sulfides, sulfoxides, sulfones, phosphines, phosphates, other phosphorus compounds, silanes, boranes, borates, alanes, aluminates. Functional groups may also be taken broadly to include organic polymer supports or inorganic support material such as alumina, and silica. Preferred examples of polar groups include NR⁵ ₂, OR⁵, SeR⁵, TeR⁵, PR⁵ ₂, AsR⁵ ₂, SbR⁵ ₂, SR⁵, BR⁵ ₂, SnR⁵ ₃, PbR⁵ ₃ and the like where R⁵ is independently a hydrocarbyl, substituted hydrocarbyl, halocarbyl or substituted halocarbyl radical as defined above and two R⁵ may join together to form a substituted or unsubstituted saturated, partially unsaturated or aromatic cyclic or polycyclic ring structure.

In some embodiments, the hydrocarbyl radical is independently selected from methyl, ethyl, ethenyl and isomers of propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, nonadecyl, eicosyl, heneicosyl, docosyl, tricosyl, tetracosyl, pentacosyl, hexacosyl, heptacosyl, octacosyl, nonacosyl, triacontyl, propenyl, butenyl, pentenyl, hexenyl, heptenyl, octenyl, nonenyl, decenyl, undecenyl, dodecenyl, tridecenyl, tetradecenyl, pentadecenyl, hexadecenyl, heptadecenyl, octadecenyl, nonadecenyl, eicosenyl, heneicosenyl, docosenyl, tricosenyl, tetracosenyl, pentacosenyl, hexacosenyl, heptacosenyl, octacosenyl, nonacosenyl, triacontenyl, propynyl, butynyl, pentynyl, hexynyl, heptynyl, octynyl, nonynyl, decynyl, undecynyl, dodecynyl, tridecynyl, tetradecynyl, pentadecynyl, hexadecynyl, heptadecynyl, octadecynyl, nonadecynyl, eicosynyl, heneicosynyl, docosynyl, tricosynyl, tetracosynyl, pentacosynyl, hexacosynyl, heptacosynyl, octacosynyl, nonacosynyl, and triacontynyl. Also included are isomers of saturated, partially unsaturated and aromatic cyclic structures wherein the radical may additionally be subjected to the types of substitutions described above. Examples include phenyl, methylphenyl, benzyl, methylbenzyl, naphthyl, cyclohexyl, cyclohexenyl, methylcyclohexyl, and the like. For this disclosure, when a radical is listed, it indicates that radical type and all other radicals formed when that radical type is subjected to the substitutions defined above. Alkyl, alkenyl and alkynyl radicals listed include all isomers including where appropriate cyclic isomers, for example, butyl includes n-butyl, 2-methylpropyl, 1-methylpropyl, tert-butyl, and cyclobutyl (and analogous substituted cyclopropyls); pentyl includes n-pentyl, cyclopentyl, 1-methylbutyl, 2-methylbutyl, 3-methylbutyl, 1-ethylpropyl, and neopentyl (and analogous substituted cyclobutyls and cyclopropyls); butenyl includes E and Z forms of 1-butenyl, 2-butenyl, 3-butenyl, 1-methyl-1-propenyl, 1-methyl-2-propenyl, 2-methyl-1-propenyl and 2-methyl-2-propenyl (and cyclobutenyls and cyclopropenyls). Cyclic compound having substitutions include all isomer forms, for example, methylphenyl would include ortho-methylphenyl, meta-methylphenyl and para-methylphenyl; dimethylphenyl would include 2,3-dimethylphenyl, 2,4-dimethylphenyl, 2,5-dimethylphenyl, 2,6-diphenylmethyl, 3,4-dimethylphenyl, and 3,5-dimethylphenyl.

A “bulky ______ carbyl” (such as a bulky hydrocarbyl or a bulky halocarbyl) is one comprising three or more carbon atoms.

A neutral ligand is a ligand that bonds to the metal atom, M, through one or more dative or coordinative bonds.

For purposes of this disclosure, the terms “catecholate” and “catecholate ligand” are defined to be a ligand comprising a phenyl ring with two oxygen atoms connected to the phenyl ring at the ring's 1 and 2 positions. The ligand connects to the metal center of the catalyst precursor through both of these oxygen atoms. This leaves four hydrogen atoms connected to the phenyl ring at its 3, 4, 5 and 6 positions. Zero, one, two, three, or four of these hydrogen atoms can independently be substituted with a hydrocarbyl radical, preferably a C₁-C₅₀. Also, adjacent catecholate hydrocarbyl radicals can join to transform the catecholate into a substituted or unsubstituted, fused-multi-ring system.

In the context of this document, “homopolymerization” would produce a polymer made from one monomer. For example, homopolymerization of propylene would produce homopolypropylene, also called polypropylene. Homopolymerization of ethylene would produce homopolyethylene, also called polyethylene. It should be noted, however, that some of the catalysts of this invention homopolymerize ethylene or propylene to non-traditional “polyethylene” and “polypropylene” structures, respectively. Likewise, “copolymerization” would produce polymers with more than one monomer type. For example, ethylene copolymers include polymers of ethylene with α-olefins, cyclic olefins and diolefins, vinylaromatic olefins, α-olefinic diolefins, substituted α-olefins, and/or acetylenically unsaturated monomers. Non-limiting examples of α-olefins include propylene, 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, 1-nonene, 1-decene, 1-undecene 1-dodecene, 1-tridecene, 1-tetradecene, 1-pentadecene, 1-hexadecene, 1-heptadecene, 1-octadecene, 1-nonadecene, 1-eicosene, 1-heneicosene, 1-docosene, 1-tricosene, 1-tetracosene, 1-pentacosene, 1-hexacosene, 1-heptacosene, 1-octacosene, 1-nonacosene, 1-triacontene, 4-methyl-1-pentene, 3-methyl-1-pentene, 5-methyl-1-nonene, 3,5,5-trimethyl-1-hexene, vinylcyclohexane, and vinylnorbornane. Non-limiting examples of cyclic olefins and diolefins include cyclobutene, cyclopentene, cyclohexene, cycloheptene, cyclooctene, cyclononene, cyclodecene, norbornene, 4-methylnorbornene, 2-methylcyclopentene, 4-methylcyclopentene, vinylcyclohexane, norbornadiene, dicyclopentadiene, 5-ethylidene-2-norbomene, vinylcyclohexene, 5-vinyl-2-norbornene, 1,3-divinylcyclopentane, 1,2-divinylcyclohexane, 1,3-divinylcyclohexane, 1,4-divinylcyclohexane, 1,5-divinylcyclooctane, 1-allyl-4-vinylcyclohexane, 1,4-diallylcyclohexane, 1-allyl-5-vinylcyclooctane, and 1,5-diallylcyclooctane. Non-limiting examples of vinylaromatic olefins include styrene, para-methylstyrene, para-t-butylstyrene, vinylnaphthylene, vinyltoluene, and divinylbenzene. Non-limiting examples of α-olefinic dienes include 1,4-hexadiene, 1,5-hexadiene, 1,5-heptadiene, 1,6-heptadiene, 6-methyl-1,6-heptadiene, 1,7-octadiene, 7-methyl-1,7-octadiene, 1,9-decadiene, 1,11-dodecene, 1,13-tetradecene and 9-methyl-1,9-decadiene. Substituted α-olefins (also called functional group containing α-olefins) include those containing at least one non-carbon Group 13 to 17 atom bound to a carbon atom of the substituted α-olefin where such substitution if silicon may be adjacent to the double bond or terminal to the double bond, or anywhere in between, and where inclusion of non-carbon and -silicon atoms such as for example B, O, S, Se, Te, N, P, Ge, Sn, Pb, As, F, Cl, Br, or I, are contemplated, where such non-carbon or -silicon moieties are sufficiently far removed from the double bond so as not to interfere with the coordination polymerization reaction with the catalyst and so to retain the generally hydrocarbyl characteristic. By sufficiently far removed from the double bond we intend that the number of carbon atoms, or the number of carbon and silicon atoms, separating the double bond and the non-carbon or -silicon moiety may be 6 or greater, e.g. 7, or 8, or 9, or 10, or 11, or 12, or 1 3, or 14 or more. The number of such carbon atom or carbon and silicon atoms, is counted from immediately adjacent to the double bond to immediately adjacent to the non-carbon or -silicon moiety. Examples include allyltrimethylsilane, divinylsilane, 8,8,8-trifluoro-1-octene, 8-methoxyoct-1-ene, 8-methylsulfanyloct-1-ene, 8-dimethylaminooct-1-ene, or combinations thereof. The use of functional group-containing α-olefins where the functional group is closer to the double bond is also within the scope of embodiments of the invention when such olefins may be incorporated in the same manner as are their α-olefin analogs. See, “Metallocene Catalysts and Borane Reagents in The Block/Graft Reactions of Polyolefins”, T. C. Chung, et al, Polym. Mater. Sci. Eng., v. 73, p. 463 (1995), and the masked α-olefin monomers of U.S. Pat. No. 5,153,282. Such monomers permit the preparation of both functional-group containing copolymers capable of subsequent derivatization, and of functional macromers which may be used as graft and block type polymeric segments. All documents cited herein are incorporated by reference for purposes of all jurisdictions where such practice is allowed. Copolymerization can also incorporate α-olefinic macromonomers of up to 2000 mer units.

For purposes of this disclosure, the term oligomer refers to compositions having 2-75 mer units and the term polymer refers to compositions having 76 or more mer units. A mer is defined as a unit of an oligomer or polymer that originally corresponded to the olefin(s) used in the oligomerization or polymerization reaction. For example, the mer of polyethylene would be ethylene.

In some structures throughout this specification, the ligand-metal connection is drawn with an arrow indicating that the electrons for the bond originally came from the ligand. At other times, a solid line showing the bond's covalent nature represents the ligand-metal connection. One of ordinary skill in the art recognizes that these depictions are interchangeable.

The term “catalyst system” is defined to mean a catalyst precursor/activator pair. When “catalyst system” is used to describe such a pair before activation, it means the unactivated catalyst (precatalyst) together with an activator and, optionally, a co-activator. When it is used to describe such a pair after activation, it means the activated catalyst and the activator or other charge-balancing moiety.

The transition metal compound may be neutral as in a precatalyst, or a charged species with a counter ion as in an activated catalyst system.

Catalyst precursor is also often referred to as precatalyst, catalyst, catalyst precursor and transition metal compound or complex. These words are used interchangeably. Activator and cocatalyst are also used interchangeably. A scavenger is a compound that is typically added to facilitate oligomerization or polymerization by scavenging impurities. Some scavengers may also act as activators and may be referred to as co-activators. A co-activator, that is not a scavenger, may also be used in conjunction with an activator in order to form an active catalyst. In some embodiments a co-activator can be pre-mixed with the transition metal compound to form an alkylated transition metal compound, also referred to as an alkylated invention compound.

Noncoordinating anion (NCA) is defined to mean an anion either that does not coordinate to the catalyst metal cation or that does coordinate to the metal cation, but only weakly. An NCA coordinates weakly enough that a neutral Lewis base, such as an olefinically or acetylenically unsaturated monomer can displace it from the catalyst center. Any metal or metalloid that can form a compatible, weakly coordinating complex may be used or contained in the noncoordinating anion. Suitable metals include, but are not limited to, aluminum, gold, and platinum. Suitable metalloids include, but are not limited to, boron, aluminum, phosphorus, and silicon.

A stoichiometric activator can be either neutral or ionic. The terms ionic activator, and stoichiometric ionic activator can be used interchangeably. Likewise, the terms neutral stoichiometric activator, and Lewis acid activator can be used interchangeably.

DETAILED DESCRIPTION OF THE INVENTION

The polymerization catalysts of this invention can be derived from the transition metal compounds (precatalyst) of formula: LMX wherein M is a Group 3 to 11 metal, preferably a Group 8, 9, 10 or 11 metal; L is a bulky bidentate or tridentate neutral ligand that is bonded to M by two or three heteroatoms and at least one heteroatom is nitrogen; X is a substituted or unsubstituted catecholate ligand provided that the substituted catecholate ligand does not contain a 1,2-diketone functionality.

A bulky bidentate or tridentate neutral ligand is one that is large enough such that one L ligand and one X ligand fill the coordination sphere about M, but excludes L ligands that are substituted and unsubstituted 2,2′-bipyridyl, 2,2′-biquinolinyl, 2,2′-bipyrazinyl, 1,10-phenanthroline, dipyridin-2-yl-amine, dipyridin-2-yl-methane, N¹-(2-amino-ethyl)ethane-1,2-diamine, N¹-(3-amino-propyl)propane-1,3-diamine, ethane-1,2-diamine, propane-1,3-diamine, cyclohexane-1,2-diamine, N,N,N′,N′-tetramethylethane-1,2-diamine, methyl-(2-methyliminoethylidene)amine, N,N′-bis(napthalen-1-ylmethylene)ethane-1,2-diamine, N,N′-bis(napthalen-1-ylmethylene)propane-1,3-diamine, N,N′-dibenzylidene-propane-1,3-diamine, N¹-napthalen-1-ylmethylene-ethane-1,2-diamine, 2-[(3-amino-propylimino)methyl]phenol, 2,4,4-trimethyl-1,5,9-triaza-cyclododec-1-ene, 1,4,7-trimethyl-[1,4,7]triazonane, [2,2;′6′2″]terpyridine, N-[2-dimethylaminoethyl)-N,N′,N′-trimethylethane-1,2-diamine, cyclopenta[2,1-b;3,4-b′]dipyridin-5-one, 2-(2-pyridylsulfanyl)pyridine, 2-(2-pyridyloxy)pyridine, benzyl-bis(pyridin-2-ylmethyl)amine, 2-pyridin-2-yl-quinoxaline, N¹-ethylidene-ethane-1,2-diamine, and bis(1H-benzoimidazol-2-ylmethyl)amine where substitution refers to replacing one or more existing hydrogen atoms bonded to carbon with another atom or group of atoms. Also excluded are 1,4-diaza-1,3-butadiene ligands containing substituents in the 2 and or 3 positions containing trihydrocarbylsiloxy groups.

The bulky bidentate or tridentate ligand, L, may be represented by the following formulae:

where E is, independently, a Group 15 element that is bonded to M, and each L must have one E that is nitrogen; G is a Group 16 element that is bonded to M; A is a bridging group containing a Group 13-16 element and an atom within A may optionally be bonded to M; x is 0 or 1 meaning that when x is 1, A is present and when x is zero, A represents a bond between two atoms; R¹ is, independently, a bulky hydrocarbyl, substituted bulky hydrocarbyl, bulky halocarbyl, or substituted bulky halocarbyl; R² is, independently, hydrogen, or a hydrocarbyl, substituted hydrocarbyl, halocarbyl, or substituted halocarbyl provided that a substituted hydrocarbyl is not substituted with trihydrocarbylsiloxy (e.g. —OSiMe₃); R³ is, independently, hydrogen, or a hydrocarbyl, substituted hydrocarbyl, halocarbyl, or substituted halocarbyl provided that a substituted hydrocarbyl is not substituted with trihydrocarbylsiloxy, or R³ is a substituted hydrocarbyl group containing a heteroatom or silicon atom directly bonded to G, E or the indicated carbon atom; R²² is, independently, hydrogen, or a hydrocarbyl, substituted hydrocarbyl, halocarbyl, or substituted halocarbyl provided that a substituted hydrocarbyl is not substituted with trihydrocarbylsiloxy (e.g. —OSiMe₃); R¹, R² and/or R³ groups on the same atom, adjacent atoms or those separated by one additional atom may join together to form a substituted or unsubstituted, saturated, partially unsaturated or aromatic cyclic or polycyclic ring structure provided that for L1, both pair of R¹ and R² do not join to form a substituted or unsubstituted pyridine, pyrazine, pyrimidine or benzimidazole ring; R²² and R³ may join together to form a substituted or unsubstituted, saturated, partially unsaturated or aromatic heterocyclic ring structure provided that for L21 and L22, R¹ and R² do not join to form a substituted or unsubstituted pyridine, pyrazine, pyrimidine or benzimidazole ring; and two R² bonded to the same atom together may form an -one (═O), a thione (═S), an -imine (═NR′″⁴⁰), or a -carbene (═CR′″₂) group where R′″ is, independently, hydrogen, hydrocarbyl, substituted hydrocarbyl, halocarbyl or substituted halocarbyl and two or more R′″ on the same carbon may join together to form a substituted or unsubstituted, saturated, partially unsaturated, or aromatic cyclic or polycyclic substituent.

A bulky hydrocarbyl, substituted bulky hydrocarbyl, bulky halocarbyl, or substituted bulky halocarbyl substituent is a group comprising 3 to 100 carbon atoms that imparts steric bulk on L such that one L ligand and one X ligand fill the coordination sphere of M. Non-limiting examples include all isomers and hydrocarbyl substituted isomers of C₃-C₁₀₀ hydrocarbyl radicals including propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, nonadecyl, eicosyl, heneicosyl, docosyl, tricosyl, tetracosyl, pentacosyl, hexacosyl, heptacosyl, octacosyl, nonacosyl, triacontyl, propenyl, butenyl, pentenyl, hexenyl, heptenyl, octenyl, nonenyl, decenyl, undecenyl, dodecenyl, tridecenyl, tetradecenyl, pentadecenyl, hexadecenyl, heptadecenyl, octadecenyl, nonadecenyl, eicosenyl, heneicosenyl, docosenyl, tricosenyl, tetracosenyl, pentacosenyl, hexacosenyl, heptacosenyl, octacosenyl, nonacosenyl, triacontenyl, propynyl, butynyl, pentynyl, hexynyl, heptynyl, octynyl, nonynyl, decynyl, undecynyl, dodecynyl, tridecynyl, tetradecynyl, pentadecynyl, hexadecynyl, heptadecynyl, octadecynyl, nonadecynyl, eicosynyl, heneicosynyl, docosynyl, tricosynyl, tetracosynyl, pentacosynyl, hexacosynyl, heptacosynyl, octacosynyl, nonacosynyl, and triacontynyl; halocarbyl radicals and all isomers of halocarbyl radicals including perfluoropropyl, perfluorobutyl, perfluoropentyl, perfluorohexyl, perfluoroheptyl, perfluorooctyl, perfluorononyl, perfluorodecyl, perfluoroundecyl, perfluorododecyl, perfluorotridecyl, perfluorotetradecyl, perfluoropentadecyl, perfluorohexadecyl, perfluoroheptadecyl, perfluorooctadecyl, perfluorononadecyl, perfluoroeicosyl, perfluoroheneicosyl, perfluorodocosyl, perfluorotricosyl, perfluorotetracosyl, perfluoropentacosyl, perfluorohexacosyl, perfluoroheptacosyl, perfluorooctacosyl, perfluorononacosyl, perfluorotriacontyl, perfluorobutenyl, perfluorobutynyl, fluoropropyl, fluorobutyl, fluoropentyl, fluorohexyl, fluoroheptyl, fluorooctyl, fluorononyl, fluorodecyl, fluoroundecyl, fluorododecyl, fluorotridecyl, fluorotetradecyl, fluoropentadecyl, fluorohexadecyl, fluoroheptadecyl, fluorooctadecyl, fluorononadecyl, fluoroeicosyl, fluoroheneicosyl, fluorodocosyl, fluorotricosyl, fluorotetracosyl, fluoropentacosyl, fluorohexacosyl, fluoroheptacosyl, fluorooctacosyl, fluorononacosyl, fluorotriacontyl, difluorobutyl, trifluorobutyl, tetrafluorobutyl, pentafluorobutyl, hexafluorobutyl, heptafluorobutyl, octafluorobutyl; substituted hydrocarbyl radicals and all isomers of substituted hydrocarbyl radicals including methoxypropyl, methoxybutyl, methoxypentyl, methoxyhexyl, methoxyheptyl, methoxyoctyl, methoxynonyl, methoxydecyl, methoxyundecyl, methoxydodecyl, methoxytridecyl, methoxytetradecyl, methoxypentadecyl, methoxyhexadecyl, methoxyheptadecyl, methoxyoctadecyl, methoxynonadecyl, methoxyeicosyl, methoxyheneicosyl, methoxydocosyl, methoxytricosyl, methoxytetracosyl, methoxypentacosyl, methoxyhexacosyl, methoxyheptacosyl, methoxyoctacosyl, methoxynonacosyl, methoxytriacontyl, butoxypropyl, butoxybutyl, butoxypentyl, butoxyhexyl, butoxyheptyl, butoxyoctyl, butoxynonyl, butoxydecyl, butoxyundecyl, butoxydodecyl, butoxytridecyl, butoxytetradecyl, butoxypentadecyl, butoxyhexadecyl, butoxyheptadecyl, butoxyoctadecyl, butoxynonadecyl, butoxyeicosyl, butoxyheneicosyl, butoxydocosyl, butoxytricosyl, butoxytetracosyl, butoxypentacosyl, butoxyhexacosyl, butoxyheptacosyl, butoxyoctacosyl, butoxynonacosyl, butoxytriacontyl, dimethylaminopropyl, dimethylaminobutyl, dimethylaminopentyl, dimethylaminohexyl, dimethylaminoheptyl, dimethylaminooctyl, dimethylaminononyl, dimethylaminodecyl, dimethylaminoundecyl, dimethylaminododecyl, dimethylaminotridecyl, dimethylaminotetradecyl, dimethylaminopentadecyl, dimethylaminohexadecyl, dimethylaminoheptadecyl, dimethylaminooctadecyl, dimethylaminononadecyl, dimethylaminoeicosyl, dimethylaminoheneicosyl, dimethylaminodocosyl, dimethylaminotricosyl, dimethylaminotetracosyl, dimethylaminopentacosyl, dimethylaminohexacosyl, dimethylaminoheptacosyl, dimethylaminooctacosyl, dimethylaminononacosyl, dimethylaminotriacontyl, trimethylsilylpropyl, trimethylsilylbutyl, trimethylsilylpentyl, trimethylsilylhexyl, trimethylsilylheptyl, trimethylsilyloctyl, trimethylsilylnonyl, trimethylsilyldecyl, trimethylsilylundecyl, trimethylsilyldodecyl, trimethylsilyltridecyl, trimethylsilyltetradecyl, trimethylsilylpentadecyl, trimethylsilylhexadecyl, trimethylsilylheptadecyl, trimethylsilyloctadecyl, trimethylsilylnonadecyl, trimethylsilyleicosyl, trimethylsilylheneicosyl, trimethylsilyldocosyl, trimethylsilyltricosyl, trimethylsilyltetracosyl, trimethylsilylpentacosyl, trimethylsilylhexacosyl, trimethylsilylheptacosyl, trimethylsilyloctacosyl, trimethylsilyinonacosyl, trimethylsilyltriacontyl and the like; phenyl, and all isomers of hydrocarbyl substituted phenyl including methylphenyl, dimethylphenyl, trimethylphenyl, tetramethylphenyl, pentamethylphenyl ethylphenyl, diethylphenyl, triethylphenyl, tetraethylphenyl, pentaethylphenyl, propylphenyl, dipropylphenyl, tripropylphenyl, tetrapropylphenyl, pentapropylphenyl butylphenyl, dibutylphenyl, tributylphenyl, tetrabutylphenyl, pentabutylphenyl, hexylphenyl, dihexylphenyl, trihexylphenyl, tetrahexylphenyl, pentahexylphenyl, dimethylethylphenyl, dimethylpropylphenyl, dimethylbutylphenyl, dimethylpentylphenyl, dimethylhexylphenyl, diethylmethylphenyl, diethylpropylphenyl, diethylbutylphenyl, diethylpentylphenyl, diethylhexylphenyl, dipropylmethylphenyl, dipropylethylphenyl, dipropylbutylphenyl, dipropylpentylphenyl, dipropylhexylphenyl, dibutylmethylphenyl, dibutylethylphenyl, dibutylpropylphenyl, dibutylpentylphenyl, dibutylhexylphenyl, methylethylphenyl, methylpropylphenyl, methylbutylphenyl, methylpentylphenyl, methylhexylphenyl, ethylpropylphenyl, ethylbutylphenyl, ethylpentylphenyl, ethylhexylphenyl, propylbutylphenyl, propylpentylphenyl, propylhexylphenyl, butylpentylphenyl, butylhexylphenyl, methoxyphenyl, ethoxyphenyl, propoxyphenyl, butoxyphenyl, pentoxyphenyl, hexoxyphenyl, dimethoxyphenyl, phenoxyphenyl, methylmethoxyphenyl, dimethylaminophenyl, dipropylaminophenyl, bis(dimethylamino)phenyl, methyl(dimethylamino)phenyl, trimethylsilylphenyl, trimethylgermylphenyl, trifluoromethylphenyl, bis(triflouromethyl)phenyl, trifluoromethoxyphenyl and the like; all isomers of halo substituted phenyl (where halo is, independently, fluoro, chloro, bromo and iodo) including halophenyl, dihalophenyl, trihalophenyl, tetrahalophenyl, and pentahalophenyl; all isomers of halo substituted hydrocarbyl substituted phenyl (where halo is, independently, fluoro, chloro, bromo and iodo) including halomethylphenyl, dihalomethylphenyl, trihalomethylphenyl, tetrahalomethylphenyl, haloethlyphenyl, dihaloethylphenyl, trihaloethylphenyl, tetrahaloethylphenyl, halopropylphenyl, dihalopropylphenyl, trihalopropylphenyl, tetrahalopropylphenyl, halobutylphenyl, dihalobutylphenyl, trihalobutylphenyl, tetrahalobutylphenyl, dihalodimethylphenyl, dihalo(trifluoromethyl)phenyl and the like; all isomers of benzyl, and all isomers of hydrocarbyl substituted benzyl including methylbenzyl, dimethylbenzyl, trimethylbenzyl, tetramethylbenzyl, pentamethylbenzyl ethylbenzyl, diethylbenzyl, triethylbenzyl, tetraethylbenzyl, pentaethylbenzyl, propylbenzyl, dipropylbenzyl, tripropylbenzyl, tetrapropylbenzyl, pentapropylbenzyl butylbenzyl, dibutylbenzyl, tributylbenzyl, tetrabutylbenzyl, pentabutylbenzyl, hexylbenzyl, dihexylbenzyl, trihexylbenzyl, tetrahexylbenzyl, pentahexylbenzyl, dimethylethylbenzyl, dimethylpropylbenzyl, dimethylbutylbenzyl, dimethylpentylbenzyl, dimethylhexylbenzyl, diethylmethylbenzyl, diethylpropylbenzyl, diethylbutylbenzyl, diethylpentylbenzyl, diethylhexylbenzyl, dipropylmethylbenzyl, dipropylethylbenzyl, dipropylbutylbenzyl, dipropylpentylbenzyl, dipropylhexylbenzyl, dibutylmethylbenzyl, dibutylethylbenzyl, dibutylpropylbenzyl, dibutylpentylbenzyl, dibutylhexylbenzyl, methylethylbenzyl, methylpropylbenzyl, methylbutylbenzyl, methylpentylbenzyl, methylhexylbenzyl, ethylpropylbenzyl, ethylbutylbenzyl, ethylpentylbenzyl, ethylhexylbenzyl, propylbutylbenzyl, propylpentylbenzyl, propylhexylbenzyl, butylpentylbenzyl, butylhexylbenzyl, methoxybenzyl, ethoxybenzyl, propoxybenzyl, butoxybenzyl, pentoxybenzyl, hexoxybenzyl, dimethoxybenzyl, phenoxybenzyl, methylmethoxybenzyl, dimethylaminobenzyl, dipropylaminobenzyl, bis(dimethylamino)benzyl, methyl(dimethylamino)benzyl, trifluoromethylbenzyl, bis(trifluoromethylbenzyl), trifluoromethyoxybenzyl, trimethylsilylbenzyl, bis(trimethylsilyl)benzyl, trimethylgernylbenzyl, diphenylmethyl and the like; trihydrocarbyl-silyl, -germyls, -stannyls and -plumbyls including trimethylsilyl, trimethylgermyl, trimethylstannyl, trimethylplumbyl, triethylsilyl, triethylgermyl, dimethylethylsilyl, dimethylethylgermyl, diethylmethylsilyl, diethylmethylgermyl, triphenylsilyl, triphenylgermyl, triphenoxysilyl, triphenoxygermyl, trimethoxysilyl, trimethoxygermyl, tirethoxysilyl, triethoxygermyl, and all isomers of tripropylsilyl, tripropylgermyl, tributylsilyl, tributylgermyl, tripropoxysilyl, tripropoxygermyl, tributoxysilyl, tributoxygermyl, tris(trifluormethyl)silyl, bis(perfluoromethyl)methylsilyl, and the like; all isomers and hydrocarbyl substituted isomers of polycyclic areneyls including pyrenyl, aceanthrylenyl, acenaphthylene, acephenanthrylenyl, azulenyl biphenylenyl, chrysenyl, coronenyl, fluoranthenyl, fluorenyl, heptacenyl, heptalenyl, heptaphenyl, hexacenyl, hexaphenyl, as-indacenyl, s-indecenyl, indenyl, ovalenyl, pentacenyl, pentalenyl, pentaphenyl, perylenyl, phenalenyl, phenanthrenyl, picenyl, pleiadenyl, pyranhrenyl, rubicenyl, naphthacenyl, tetraphenylenyl, trinaphthylenyl, triphenylenyl, hexahelicenyl, naphthyl, anthracenyl, dibenza[a,b]anthracenyl, indanyl, acenaphthenyl, cholanthrenyl, aceanthrenyl, acephenanthrenyl, 1,2,3,4-tetrahydronapthalene, fullerenyl, and the like; all isomers and hydrocarbyl substituted isomers of alicyclic monocyclic and polycyclic hydrocarbon rings including cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cyclohexenyl, cycloheptyl, cyclooctyl, cyclononyl, cyclodecyl, cycloundecyl, and cyclododecyl, dimethylcyclohexyl, norbomyl, norbomenyl, adamantyl, cubanyl, prismanyl, spiro[4,5]decanyl, and the like; all isomers and hydrocarbyl substituted isomers of ring assemblies including biphenyl, bicyclopentyl, terphenyl, quatercyclohexanyl, binaphthyl, binorbomyl, phenyl-terphenyl, and the like; all isomers and hydrocarbyl substituted isomers of bridged monocyclic and polycyclic arenyls including 1,1-diphenylmethano, 1,1-dinapthyletheno, and the like; all isomers of heterocycles and hydrocarbyl substituted heterocycles including acridarsinyl, acridinyl, acridophosphinyl, 1H-acrindolinyl, anthrazinyl, anthyridinyl, arsanthridinyl, arsindolyl, arsindolizinyl, arsinolinyl, arsinolizinyl, benzofuranyl, carbazolyl, β-carbolinyl, chromenyl, thiochromenyl, cinnolinyl, furanyl, imidazolyl, indazolyl, indolyl, indolizinyl, isoarsindolyl, isoarsinolinyl, isobenzofuranyl, isochromenyl, isothiochromenyl, isoindolyl, isophosphindolyl, isophosphinolinyl, isoquinolinyl, isothiazolyl, isoxazolyl, naphthyridinyl, oxazolyl, perimidinyl, phenanthrazinyl, phenanthridinyl, phenanthrolinyl, phenazinyl, phosphanthridinyl, phosphindolyl, phosphindolizinyl, phosphinolizinyl, phthalazinyl, pteridinyl, phthaloperinyl, purinyl, pyranyl, thiopyranal, pyrazinyl, pyrazolyl, pyridazinyl, pyridinyl, pyrindinyl, pyrimidinyl, pyrrolyl, pyrrolizinyl, quinazolinyl, quindolinyl, 1H-quinindolinyl, quinolinyl, quinolizinyl, quinoxalinyl, selenophenyl, thebenidinyl, thiazolyl, thiophenyl, triphenodioxazinyl, triphenodithiazinyl, xanthenyl, chromanyl, thiochromanyl, imidazolidinyl, indolinyl, isochromanyl, isothiochromanyl, isoindolinyl, morpholinyl, piperazinyl, piperidinyl, pyrozolidinyl, pyrrolidinyl, quinuclidinyl, dimethylacridarsinyl, dimethylacridinyl, dimethylacridophosphinyl, dimethyl-1H-acrindolinyl, dimethylanthrazinyl, dimethylanthyridinyl, dimethylarsanthridinyl, dimethylarsindolyl, dimethylarsindolizinyl, dimethylarsinolinyl, dimethylarsinolizinyl, dibutylbenzofuranyl, dibutylcarbazolyl, dibutyl-β-carbolinyl, dibutylchromenyl, dibutylthiochromenyl, butylcinnolinyl, dibutylfuranyl, dimethylimidazolyl, dimethylindazolyl, dipropylindolyl, dipropylindolizinyl, dimethylisoarsindolyl, methylisoarsinolinyl, dimethylisobenzofuranyl, diphenylisochromenyl, dibutylisothiochromenyl, phenylisoindolyl, butylisophosphindolyl, dibutylisophosphinolinyl, dimethylisoquinolinyl, methylisothiazolyl, butylisoxazolyl, butylnaphthyridinyl, dimethyloxazolyl, methylphenylperimidinyl, tetrabutylphenanthrazinyl, propylphenanthridinyl, dibutylphenanthrolinyl, tetramethylphenazinyl, butylphosphanthridinyl, phenylphosphindolyl, dimethylphosphindolizinyl, methylphosphinolizinyl, dibutylphthalazinyl, trimethylpteridinyl, methylphthaloperinyl, dimethylpurinyl, dibutylpyranyl, dibutylthiopyranal, trimethylpyrazinyl, phenylpyrazolyl, dipropylpyridazinyl, dimethylpyridinyl, methylpropylpyrindinyl, triethylpyrimidinyl, dibutylpyrrolyl, diethylpyrrolizinyl, dibutylquinazolinyl, dibutylquindolinyl, dibutyl-1H-quinindolinyl, dimethylquinolinyl, propylquinolizinyl, methylquinoxalinyl, methylbutylselenophenyl, methylthebenidinyl, dimethylthiazolyl, trimethylthiophenyl, dibutyltriphenodioxazinyl, dibutyltriphenodithiazinyl, dibutylxanthenyl, trimethylchromanyl, dimethylthiochromanyl, dimethylimidazolidinyl, dimethylindolinyl, dibutylisochromanyl, dibutylisothiochromanyl, phenylisoindolinyl, dibutylmorpholinyl, dimethylpiperazinyl, dimethylpiperidinyl, dimethylpyrozolidinyl, dimethylpyrrolidinyl, bipyridyl, pyrido[2,1,6-de]quinolizinyl, hexamethylquinuclidinyl, 5,7-dioxa-6-phosphadibenzo[a,c]cycloheptene-6-oxide, 9-oxa-10-phosphaphenanthrene-10-oxide and the like.

The bridging group A may be represented by the following formulae: R′₂C, R′₂Si, R′₂Ge, R′₂CCR′₂, R′₂CCR′₂CR′₂, R′₂CCR′₂CR′₂CR′₂, R′C═CR′, R′C═CR′CR′₂, R′₂CCR′═CR′CR′₂, R′C═CR′CR′═CR′, R′C═CR′CR′₂CR′₂, R′₂CSiR′₂, R′₂SiSiR′₂, R′₂CSiR′₂CR′₂, R′₂SiCR′₂SiR′₂, R′C═CR′SiR′₂, R′₂CGeR′₂, R′₂GeGeR′₂, R′₂CGeR′₂CR′₂, R′₂GeCR′₂GeR′₂, R′₂SiGeR′₂, R′C═CR′GeR′₂, R′B, R′₂C—BR′, R′₂C—BR′—CR′₂, R′N, R′P, O, S, Se, C(═O)C(═O), R′₂CC(═O), R′₂CC(═O)CR′₂, R′₂C—O—CR′₂, R′₂CR′₂C—O—CR′₂CR′₂, R′₂C—O—CR′₂CR′₂, R′₂C—O—CR′═CR′, R′₂C—S—CR′₂, R′₂CR′₂C—S—CR′₂CR′₂, R′₂C—S—CR′₂CR′₂, R′₂C—S—CR′═CR′, R′₂C—Se—CR′₂, R′₂CR′₂C—Se—CR′₂CR′₂, R′₂C—Se—CR′₂CR′₂, R′₂C—Se—CR′═CR′, R′₂C—N═CR′, R′₂C—NR′—CR′₂, R′₂C—NR′—CR′₂CR′₂, R′₂C—NR′—CR′═CR′, R′₂CR′₂C—NR′—CR′₂CR′₂, R′₂C—P═CR′, and R′₂C—PR′—CR′₂ where the bonding of A is illustrated in formulae L1-L23, R′ is, independently, hydrogen, hydrocarbyl, substituted hydrocarbyl, halocarbyl or substituted halocarbyl provided that a substituted hydrocarbyl is not substituted with trihydrocarbylsiloxy, and two or more R′ on the same carbon or adjacent R′ may join together to form a substituted or unsubstituted, saturated, partially unsaturated, or aromatic cyclic or polycyclic substituent. Non-limiting examples of cyclic bridging groups useful as A are illustrated below. The connection (bonding) points of the cyclic structures are designated by the “dots”.

where R″ is, independently, hydrogen, hydrocarbyl, substituted hydrocarbyl, halocarbyl or substituted halocarbyl provided that a substituted hydrocarbyl is not substituted with trihydrocarbylsiloxy, and two or more R″ on the same carbon or adjacent R″ may join together to form a substituted or unsubstituted, saturated, partially unsaturated, or aromatic cyclic or polycyclic substituent.

The substituted or unsubstituted catecholate ligand, X, may be represented by the following formula:

where each O is bonded to M, and where R^(a), R^(b), R^(c) and R^(d) are, independently, hydrogen, hydrocarbyl, substituted hydrocarbyl, halocarbyl or substituted halocarbyl, and optionally two or more adjacent R^(a), R^(b), R^(c) and/or R^(d) may join together to form a substituted or unsubstituted, saturated, partially unsaturated, or aromatic cyclic or polycyclic substituent.

Some invention embodiments, independently, select R^(a), R^(b), R^(c) and R^(d) from hydrogen, methyl, ethyl, ethenyl, ethynyl and all isomers of propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, nonadecyl, eicosyl, heneicosyl, docosyl, tricosyl, tetracosyl, pentacosyl, hexacosyl, heptacosyl, octacosyl, nonacosyl, triacontyl, propenyl, butenyl, pentenyl, hexenyl, heptenyl, octenyl, nonenyl, decenyl, undecenyl, dodecenyl, tridecenyl, tetradecenyl, pentadecenyl, hexadecenyl, heptadecenyl, octadecenyl, nonadecenyl, eicosenyl, heneicosenyl, docosenyl, tricosenyl, tetracosenyl, pentacosenyl, hexacosenyl, heptacosenyl, octacosenyl, nonacosenyl, triacontenyl, propynyl, butynyl, pentynyl, hexynyl, heptynyl, octynyl, nonynyl, decynyl, undecynyl, dodecynyl, tridecynyl, tetradecynyl, pentadecynyl, hexadecynyl, heptadecynyl, octadecynyl, nonadecynyl, eicosynyl, heneicosynyl, docosynyl, tricosynyl, tetracosynyl, pentacosynyl, hexacosynyl, heptacosynyl, octacosynyl, nonacosynyl, and triacontynyl, phenyl, napthyl, anthracenyl, pyrenyl, biphenyl, benzyl, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, cyclononyl, cyclodecyl, cycloundecyl, cyclododecyl, fluoro, chloro, bromo, iodo, trimethylsilyl, triethylsilyl, tripropylsilyl, dimethylethylsilyl, diethylmethylsilyl, trimethoxysilyl, tirethoxysilyl, tripropoxysilyl, methoxy, ethoxy, propoxy, butoxy, phenoxy, or a nitro, carboxylic acid, ester, ketone (excluding 1,2-diketones) or aldehyde group. It is preferred that at least one R^(a), R^(b), R^(c) or R^(d) is not hydrogen.

Below are non-limiting examples in which the catecholate has been transformed into a fused ring system:

where R is, independently, hydrogen, methyl, ethyl, ethenyl, ethynyl and all isomers of propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, nonadecyl, eicosyl, heneicosyl, docosyl, tricosyl, tetracosyl, pentacosyl, hexacosyl, heptacosyl, octacosyl, nonacosyl, triacontyl, propenyl, butenyl, pentenyl, hexenyl, heptenyl, octenyl, nonenyl, decenyl, undecenyl, dodecenyl, tridecenyl, tetradecenyl, pentadecenyl, hexadecenyl, heptadecenyl, octadecenyl, nonadecenyl, eicosenyl, heneicosenyl, docosenyl, tricosenyl, tetracosenyl, pentacosenyl, hexacosenyl, heptacosenyl, octacosenyl, nonacosenyl, triacontenyl, propynyl, butynyl, pentynyl, hexynyl, heptynyl, octynyl, nonynyl, decynyl, undecynyl, dodecynyl, tridecynyl, tetradecynyl, pentadecynyl, hexadecynyl, heptadecynyl, octadecynyl, nonadecynyl, eicosynyl, heneicosynyl, docosynyl, tricosynyl, tetracosynyl, pentacosynyl, hexacosynyl, heptacosynyl, octacosynyl, nonacosynyl, and triacontynyl, phenyl, napthyl, anthracenyl, pyrenyl, biphenyl, benzyl, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, cyclononyl, cyclodecyl, cycloundecyl, cyclododecyl, fluoro, chloro, bromo, iodo, trimethylsilyl, triethylsilyl, tripropylsilyl, dimethylethylsilyl, diethylmethylsilyl, trimethoxysilyl, tirethoxysilyl, tripropoxysilyl, methoxy, ethoxy, propoxy, butoxy, phenoxy, or a nitro, carboxylic acid, ester, ketone (excluding 1,2-diketones) or aldehyde group. Two R groups can connect to form substituted or unsubstituted, saturated, partially unsaturated or aromatic ring structures.

Below are non-limiting examples in which the catecholate has been fully or partially hydrogenated:

where R is, independently, hydrogen, methyl, ethyl, ethenyl, ethynyl and all isomers of propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, nonadecyl, eicosyl, heneicosyl, docosyl, tricosyl, tetracosyl, pentacosyl, hexacosyl, heptacosyl, octacosyl, nonacosyl, triacontyl, propenyl, butenyl, pentenyl, hexenyl, heptenyl, octenyl, nonenyl, decenyl, undecenyl, dodecenyl, tridecenyl, tetradecenyl, pentadecenyl, hexadecenyl, heptadecenyl, octadecenyl, nonadecenyl, eicosenyl, heneicosenyl, docosenyl, tricosenyl, tetracosenyl, pentacosenyl, hexacosenyl, heptacosenyl, octacosenyl, nonacosenyl, triacontenyl, propynyl, butynyl, pentynyl, hexynyl, heptynyl, octynyl, nonynyl, decynyl, undecynyl, dodecynyl, tridecynyl, tetradecynyl, pentadecynyl, hexadecynyl, heptadecynyl, octadecynyl, nonadecynyl, eicosynyl, heneicosynyl, docosynyl, tricosynyl, tetracosynyl, pentacosynyl, hexacosynyl, heptacosynyl, octacosynyl, nonacosynyl, and triacontynyl, phenyl, napthyl, anthracenyl, pyrenyl, biphenyl, benzyl, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, cyclononyl, cyclodecyl, cycloundecyl, cyclododecyl, fluoro, chloro, bromo, iodo, trimethylsilyl, triethylsilyl, tripropylsilyl, dimethylethylsilyl, diethylrnethylsilyl, trimethoxysilyl, tirethoxysilyl, tripropoxysilyl, methoxy, ethoxy, propoxy, butoxy, phenoxy, or a nitro, carboxylic acid, ester, ketone (excluding 1,2-diketones) or aldehyde group. Two R groups can connect to form substituted or unsubstituted, saturated, partially unsaturated or aromatic ring structures. It is preferred that at least one R group is not hydrogen.

Below are non-limiting examples of catecholate-like ligands that may be used in place of the catecholate ligand:

where R is, independently, hydrogen, methyl, ethyl, ethenyl, ethynyl and all isomers of propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, nonadecyl, eicosyl, heneicosyl, docosyl, tricosyl, tetracosyl, pentacosyl, hexacosyl, heptacosyl, octacosyl, nonacosyl, triacontyl, propenyl, butenyl, pentenyl, hexenyl, heptenyl, octenyl, nonenyl, decenyl, undecenyl, dodecenyl, tridecenyl, tetradecenyl, pentadecenyl, hexadecenyl, heptadecenyl, octadecenyl, nonadecenyl, eicosenyl, heneicosenyl, docosenyl, tricosenyl, tetracosenyl, pentacosenyl, hexacosenyl, heptacosenyl, octacosenyl, nonacosenyl, triacontenyl, propynyl, butynyl, pentynyl, hexynyl, heptynyl, octynyl, nonynyl, decynyl, undecynyl, dodecynyl, tridecynyl, tetradecynyl, pentadecynyl, hexadecynyl, heptadecynyl, octadecynyl, nonadecynyl, eicosynyl, heneicosynyl, docosynyl, tricosynyl, tetracosynyl, pentacosynyl, hexacosynyl, heptacosynyl, octacosynyl, nonacosynyl, and triacontynyl, phenyl, napthyl, anthracenyl, pyrenyl, biphenyl, benzyl, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, cyclononyl, cyclodecyl, cycloundecyl, cyclododecyl, fluoro, chloro, bromo, iodo, trimethylsilyl, triethylsilyl, tripropylsilyl, dimethylethylsilyl, diethylmethylsilyl, trimethoxysilyl, tirethoxysilyl, tripropoxysilyl, methoxy, ethoxy, propoxy, butoxy, phenoxy, or a nitro, carboxylic acid, ester, ketone (excluding 1,2-diketones) or aldehyde group. Two R groups can connect to form substituted or unsubstituted, saturated, partially unsaturated or aromatic ring structures. It is preferred that at least one R group is not hydrogen.

Some embodiments select at least one or two R^(a), R^(b), R^(c) or R^(d) to be a hydrocarbyl substituent such as butyl. Below are non-limiting examples in which the catecholate may contain substituents:

where X* is, independently, F, Cl, Br, I, OR**, SR**₂, NR**₂, PR**₂, NO₂; each R* and each R** are, independently, methyl, ethyl, n-propyl, iso-propyl, n-butyl, sec-butyl, tert-butyl, or cyclohexyl. R* is most preferably tert-butyl or iso-propyl, R** is most preferably methyl, and X* is most preferably F, Cl, Br or OR**.

Preferred transition metals, M, include those from Group 8 (Fe, Ru, Os), Group 9 (Co, Rh, Ir), Group 10 (Ni, Pd, Pt), and Group 11 (Cu, Ag, Au). Most preferred transition metals include Fe, Co, Ni, and Pd.

Preferred bulky bidentate or tridentate neutrally charged ligands, L, include:

where R¹ is, independently, a bulky hydrocarbyl, substituted bulky hydrocarbyl, bulky halocarbyl, or substituted bulky halocarbyl; R² is, independently, hydrogen, or a hydrocarbyl, substituted hydrocarbyl, halocarbyl, or substituted halocarbyl provided that a substituted hydrocarbyl is not substituted with trihydrocarbylsiloxy (e.g. —OSiMe₃); R³ is, independently, hydrogen, or a hydrocarbyl, substituted hydrocarbyl, halocarbyl, or substituted halocarbyl, or R³ is a substituted hydrocarbyl group containing a heteroatom or silicon atom directly bonded to the indicated O or S atom; R⁴ is, independently, hydrogen, or a hydrocarbyl, substituted hydrocarbyl, halocarbyl, or substituted halocarbyl, preferably R⁴ is, independently, a bulky hydrocarbyl, substituted bulky hydrocarbyl, bulky halocarbyl, or substituted bulky halocarbyl. R¹, R², R³ and/or R⁴ groups on the same atom, adjacent atoms or those separated by one additional atom may join together to form a substituted or unsubstituted, saturated, partially unsaturated or aromatic cyclic or polycyclic ring structure provided that for L*1, both pair of R¹ and R² do not join to form a substituted or unsubstituted pyridine, pyrazine, pyrimidine or benzimidazole ring; and two R² bonded to the same atom together may form an -one (═O), a thione (═S), an -imine (═NR′″⁴⁰ ), or a -carbene (═CR′″₂) group where R′″ is, independently, hydrogen, hydrocarbyl, substituted hydrocarbyl, halocarbyl or substituted halocarbyl and two or more R′″ on the same carbon may join together to form a substituted or unsubstituted, saturated, partially unsaturated, or aromatic cyclic or polycyclic substituent. For purposes of the claims to this invention when the phrase “where L is represented by the formulae L*1 to L*410″ is used it is defined to mean the drawings of the formulae in the above table but not the definitions of the symbols in this paragraph.

Non-limiting examples of preferred bulky hydrocarbyl groups useful as R¹, include substituents represented by the following structures:

where R¹⁰, R¹¹, R¹², and R¹³ are, independently, hydrogen, hydrocarbyl radicals, substituted hydrocarbyl radicals, halocarbyl radicals, substituted halocarbyl radicals, silylcarbyl radicals or polar radicals. Some invention embodiments select R¹⁰, R¹¹, R¹², and R¹³ from hydrogen or hydrocarbyl radicals including methyl, ethyl, ethenyl, ethynyl and all isomers of propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, nonadecyl, eicosyl, heneicosyl, docosyl, tricosyl, tetracosyl, pentacosyl, hexacosyl, heptacosyl, octacosyl, nonacosyl, triacontyl, propenyl, butenyl, pentenyl, hexenyl, heptenyl, octenyl, nonenyl, decenyl, undecenyl, dodecenyl, tridecenyl, tetradecenyl, pentadecenyl, hexadecenyl, heptadecenyl, octadecenyl, nonadecenyl, eicosenyl, heneicosenyl, docosenyl, tricosenyl, tetracosenyl, pentacosenyl, hexacosenyl, heptacosenyl, octacosenyl, nonacosenyl, triacontenyl, propynyl, butynyl, pentynyl, hexynyl, heptynyl, octynyl, nonynyl, decynyl, undecynyl, dodecynyl, tridecynyl, tetradecynyl, pentadecynyl, hexadecynyl, heptadecynyl, octadecynyl, nonadecynyl, eicosynyl, heneicosynyl, docosynyl, tricosynyl, tetracosynyl, pentacosynyl, hexacosynyl, heptacosynyl, octacosynyl, nonacosynyl, and triacontynyl; from halocarbyls and all isomers of halocarbyls including perfluoropropyl, perfluorobutyl, perfluoropentyl, perfluorohexyl, perfluoroheptyl, perfluorooctyl, perfluorononyl, perfluorodecyl, perfluoroundecyl, perfluorododecyl, perfluorotridecyl, perfluorotetradecyl, perfluoropentadecyl, perfluorohexadecyl, perfluoroheptadecyl, perfluorooctadecyl, perfluorononadecyl, perfluoroeicosyl, perfluoroheneicosyl, perfluorodocosyl, perfluorotricosyl, perfluorotetracosyl, perfluoropentacosyl, perfluorohexacosyl, perfluoroheptacosyl, perfluorooctacosyl, perfluorononacosyl, perfluorotriacontyl, perfluorobutenyl, perfluorobutynyl, fluoropropyl, fluorobutyl, fluoropentyl, fluorohexyl, fluoroheptyl, fluorooctyl, fluorononyl, fluorodecyl, fluoroundecyl, fluorododecyl, fluorotridecyl, fluorotetradecyl, fluoropentadecyl, fluorohexadecyl, fluoroheptadecyl, fluorooctadecyl, fluorononadecyl, fluoroeicosyl, fluoroheneicosyl, fluorodocosyl, fluorotricosyl, fluorotetracosyl, fluoropentacosyl, fluorohexacosyl, fluoroheptacosyl, fluorooctacosyl, fluorononacosyl, fluorotriacontyl, difluorobutyl, trifluorobutyl, tetrafluorobutyl, pentafluorobutyl, hexafluorobutyl, heptafluorobutyl, octafluorobutyl; from substituted hydrocarbyl radicals and all isomers of substituted hydrocarbyl radicals including methoxypropyl, methoxybutyl, methoxypentyl, methoxyhexyl, methoxyheptyl, methoxyoctyl, methoxynonyl, methoxydecyl, methoxyundecyl, methoxydodecyl, methoxytridecyl, methoxytetradecyl, methoxypentadecyl, methoxyhexadecyl, methoxyheptadecyl, methoxyoctadecyl, methoxynonadecyl, methoxyeicosyl, methoxyheneicosyl, methoxydocosyl, methoxytricosyl, methoxytetracosyl, methoxypentacosyl, methoxyhexacosyl, methoxyheptacosyl, methoxyoctacosyl, methoxynonacosyl, methoxytriacontyl, butoxypropyl, butoxybutyl, butoxypentyl, butoxyhexyl, butoxyheptyl, butoxyoctyl, butoxynonyl, butoxydecyl, butoxyundecyl, butoxydodecyl, butoxytridecyl, butoxytetradecyl, butoxypentadecyl, butoxyhexadecyl, butoxyheptadecyl, butoxyoctadecyl, butoxynonadecyl, butoxyeicosyl, butoxyheneicosyl, butoxydocosyl, butoxytricosyl, butoxytetracosyl, butoxypentacosyl, butoxyhexacosyl, butoxyheptacosyl, butoxyoctacosyl, butoxynonacosyl, butoxytriacontyl, dimethylaminopropyl, dimethylaminobutyl, dimethylaminopentyl, dimethylaminohexyl, dimethylaminoheptyl, dimethylaminooctyl, dimethylaminononyl, dimethylaminodecyl, dimethylaminoundecyl, dimethylaminododecyl, dimethylaminotridecyl, dimethylaminotetradecyl, dimethylaminopentadecyl, dimethylaminohexadecyl, dimethylaminoheptadecyl, dimethylaminooctadecyl, dimethylaminononadecyl, dimethylaminoeicosyl, dimethylaminoheneicosyl, dimethylaminodocosyl, dimethylaminotricosyl, dimethylaminotetracosyl, dimethylaminopentacosyl, dimethylaminohexacosyl, dimethylaminoheptacosyl, dimethylaminooctacosyl, dimethylaminononacosyl, dimethylaminotriacontyl, trimethylsilylpropyl, trimethylsilylbutyl, trimethylsilylpentyl, trimethylsilylhexyl, trimethylsilylheptyl, trimethylsilyloctyl, trimethylsilylnonyl, trimethylsilyldecyl, trimethylsilylundecyl, trimethylsilyldodecyl, trimethylsilyltridecyl, trimethylsilyltetradecyl, trimethylsilylpentadecyl, trimethylsilylhexadecyl, trimethylsilylheptadecyl, trimethylsilyloctadecyl, trimethylsilylnonadecyl, trimethylsilyleicosyl, trimethylsilylheneicosyl, trimethylsilyldocosyl, trimethylsilyltricosyl, trimethylsilyltetracosyl, trimethylsilylpentacosyl, trimethylsilylhexacosyl, trimethylsilylheptacosyl, trimethylsilyloctacosyl, trimethylsilylnonacosyl, trimethylsilyltriacontyl and the like; from phenyl, and all isomers of hydrocarbyl substituted phenyl including methylphenyl, dimethylphenyl, trimethylphenyl, tetramethylphenyl, pentamethylphenyl ethylphenyl, diethylphenyl, triethylphenyl, tetraethylphenyl, pentaethylphenyl, propylphenyl, dipropylphenyl, tripropylphenyl, tetrapropylphenyl, pentapropylphenyl butylphenyl, dibutylphenyl, tributylphenyl, tetrabutylphenyl, pentabutylphenyl, hexylphenyl, dihexylphenyl, trihexylphenyl, tetrahexylphenyl, pentahexylphenyl, dimethylethylphenyl, dimethylpropylphenyl, dimethylbutylphenyl, dimethylpentylphenyl, dimethylhexylphenyl, diethylmethylphenyl, diethylpropylphenyl, diethylbutylphenyl, diethylpentylphenyl, diethylhexylphenyl, dipropylmethylphenyl, dipropylethylphenyl, dipropylbutylphenyl, dipropylpentylphenyl, dipropylhexylphenyl, dibutylmethylphenyl, dibutylethylphenyl, dibutylpropylphenyl, dibutylpentylphenyl, dibutylhexylphenyl, methylethylphenyl, methylpropylphenyl, methylbutylphenyl, methylpentylphenyl, methylhexylphenyl, ethylpropylphenyl, ethylbutylphenyl, ethylpentylphenyl, ethylhexylphenyl, propylbutylphenyl, propylpentylphenyl, propylhexylphenyl, butylpentylphenyl, butylhexylphenyl, trimethylsilylphenyl, trimethylgermylphenyl, trifluoromethylphenyl, bis(triflouromethyl)phenyl and the like; from all isomers of halo substituted phenyl (where halo is, independently, fluoro, chloro, bromo and iodo) including halophenyl, dihalophenyl, trihalophenyl, tetrahalophenyl, and pentahalophenyl; from all isomers of halo substituted hydrocarbyl substituted phenyl (where halo is, independently, fluoro, chloro, bromo and iodo) including halomethylphenyl, dihalomethylphenyl, trihalomethylphenyl, tetrahalomethylphenyl, haloethlyphenyl, dihaloethylphenyl, trihaloethylphenyl, tetrahaloethylphenyl, halopropylphenyl, dihalopropylphenyl, trihalopropylphenyl, tetrahalopropylphenyl, halobutylphenyl, dihalobutylphenyl, trihalobutylphenyl, tetrahalobutylphenyl, dihalodimethylphenyl, dihalo(trifluoromethyl)phenyl and the like; from all isomers of benzyl, and all isomers of hydrocarbyl substituted benzyl including methylbenzyl, dimethylbenzyl, trimethylbenzyl, tetramethylbenzyl, pentamethylbenzyl ethylbenzyl, diethylbenzyl, triethylbenzyl, tetraethylbenzyl, pentaethylbenzyl, propylbenzyl, dipropylbenzyl, tripropylbenzyl, tetrapropylbenzyl, pentapropylbenzyl butylbenzyl, dibutylbenzyl, tributylbenzyl, tetrabutylbenzyl, pentabutylbenzyl, hexylbenzyl, dihexylbenzyl, trihexylbenzyl, tetrahexylbenzyl, pentahexylbenzyl, dimethylethylbenzyl, dimethylpropylbenzyl, dimethylbutylbenzyl, dimethylpentylbenzyl, dimethylhexylbenzyl, diethylmethylbenzyl, diethylpropylbenzyl, diethylbutylbenzyl, diethylpentylbenzyl, diethylhexylbenzyl, dipropylmethylbenzyl, dipropylethylbenzyl, dipropylbutylbenzyl, dipropylpentylbenzyl, dipropylhexylbenzyl, dibutylmethylbenzyl, dibutylethylbenzyl, dibutylpropylbenzyl, dibutylpentylbenzyl, dibutylhexylbenzyl, methylethylbenzyl, methylpropylbenzyl, methylbutylbenzyl, methylpentylbenzyl, methylhexylbenzyl, ethylpropylbenzyl, ethylbutylbenzyl, ethylpentylbenzyl, ethylhexylbenzyl, propylbutylbenzyl, propylpentylbenzyl, propylhexylbenzyl, butylpentylbenzyl, butylhexylbenzyl, trimethylsilylbenzyl, bis(trimethylsilyl)benzyl, trimethylgermylbenzyl, diphenylmethyl and the like; from trihydrocarbyl-silyl, -germyls, -stannyls and -plumbyls including trimethylsilyl, trimethylgermyl, trimethylstannyl, trimethylplumbyl, triethylsilyl, triethylgermyl, dimethylethylsilyl, dimethylethylgermyl, diethylmethylsilyl, diethylmethylgermyl, triphenylsilyl, triphenylgernyl, and all isomers of tripropylsilyl, tripropylgermyl, tributylsilyl, tributylgermyl, tris(trifluormethyl)silyl, bis(perfluoromethyl)methylsilyl, and the like; from all isomers and hydrocarbyl substituted isomers of polycyclic areneyls including pyrenyl, aceanthrylenyl, acenaphthylene, acephenanthrylenyl, azulenyl biphenylenyl, chrysenyl, coronenyl, fluoranthenyl, fluorenyl, heptacenyl, heptalenyl, heptaphenyl, hexacenyl, hexaphenyl, as-indacenyl, s-indecenyl, indenyl, ovalenyl, pentacenyl, pentalenyl, pentaphenyl, perylenyl, phenalenyl, phenanthrenyl, picenyl, pleiadenyl, pyranhrenyl, rubicenyl, naphthacenyl, tetraphenylenyl, trinaphthylenyl, triphenylenyl, hexahelicenyl, naphthyl, anthracenyl, dibenza[a,b]anthracenyl, indanyl, acenaphthenyl, cholanthrenyl, aceanthrenyl, acephenanthrenyl, 1,2,3,4-tetrahydronapthalene, fullerenyl, and the like; from all isomers and hydrocarbyl substituted isomers of alicyclic monocyclic and polycyclic hydrocarbon rings including cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cyclohexenyl, cycloheptyl, cyclooctyl, cyclononyl, cyclodecyl, cycloundecyl, and cyclododecyl, dimethylcyclohexyl, norbomyl, norbornenyl, adamantyl, cubanyl, prismanyl, spiro[4,5]decanyl, and the like; from all isomers and hydrocarbyl substituted isomers of ring assemblies including biphenyl, bicyclopentyl, terphenyl, quatercyclohexanyl, binaphthyl, binorbornyl, phenyl-terphenyl, and the like; from all isomers and hydrocarbyl substituted isomers of bridged monocyclic and polycyclic arenyls including 1,1-diphenylmethano, 1,1-dinapthyletheno, and the like; from all isomers of heterocycles and hydrocarbyl substituted heterocycles including acridarsinyl, acridinyl, acridophosphinyl, 1H-acrindolinyl, anthrazinyl, anthyridinyl, arsanthridinyl, arsindolyl, arsindolizinyl, arsinolinyl, arsinolizinyl, benzofuranyl, carbazolyl, β-carbolinyl, chromenyl, thiochromenyl, cinnolinyl, furanyl, imidazolyl, indazolyl, indolyl, indolizinyl, isoarsindolyl, isoarsinolinyl, isobenzofuranyl, isochromenyl, isothiochromenyl, isoindolyl, isophosphindolyl, isophosphinolinyl, isoquinolinyl, isothiazolyl, isoxazolyl, naphthyridinyl, oxazolyl, perimidinyl, phenanthrazinyl, phenanthridinyl, phenanthrolinyl, phenazinyl, phosphanthridinyl, phosphindolyl, phosphindolizinyl, phosphinolizinyl, phthalazinyl, pteridinyl, phthaloperinyl, purinyl, pyranyl, thiopyranal, pyrazinyl, pyrazolyl, pyridazinyl, pyridinyl, pyrindinyl, pyrimidinyl, pyrrolyl, pyrrolizinyl, quinazolinyl, quindolinyl, 1H-quinindolinyl, quinolinyl, quinolizinyl, quinoxalinyl, selenophenyl, thebenidinyl, thiazolyl, thiophenyl, triphenodioxazinyl, triphenodithiazinyl, xanthenyl, chromanyl, thiochromanyl, imidazolidinyl, indolinyl, isochromanyl, isothiochromanyl, isoindolinyl, morpholinyl, piperazinyl, piperidinyl, pyrozolidinyl, pyrrolidinyl, quinuclidinyl, dimethylacridarsinyl, dimethylacridinyl, dimethylacridophosphinyl, dimethyl-1H-acrindolinyl, dimethylanthrazinyl, dimethylanthyridinyl, dimethylarsanthridinyl, dimethylarsindolyl, dimethylarsindolizinyl, dimethylarsinolinyl, dimethylarsinolizinyl, dibutylbenzofuranyl, dibutylcarbazolyl, dibutyl-β-carbolinyl, dibutylchromenyl, dibutylthiochromenyl, butylcinnolinyl, dibutylfuranyl, dimethylimidazolyl, dimethylindazolyl, dipropylindolyl, dipropylindolizinyl, dimethylisoarsindolyl, methylisoarsinolinyl, dimethylisobenzofuranyl, diphenylisochromenyl, dibutylisothiochromenyl, phenylisoindolyl, butylisophosphindolyl, dibutylisophosphinolinyl, dimethylisoquinolinyl, methylisothiazolyl, butylisoxazolyl, butylnaphthyridinyl, dimethyloxazolyl, methylphenylperimidinyl, tetrabutylphenanthrazinyl, propylphenanthridinyl, dibutylphenanthrolinyl, tetramethylphenazinyl, butylphosphanthridinyl, phenylphosphindolyl, dimethylphosphindolizinyl, methylphosphinolizinyl, dibutylphthalazinyl, trimethylpteridinyl, methylphthaloperinyl, dimethylpurinyl, dibutylpyranyl, dibutylthiopyranal, trimethylpyrazinyl, phenylpyrazolyl, dipropylpyridazinyl, dimethylpyridinyl, methylpropylpyrindinyl, triethylpyrimidinyl, dibutylpyrrolyl, diethylpyrrolizinyl, dibutylquinazolinyl, dibutylquindolinyl, dibutyl-1H-quinindolinyl, dimethylquinolinyl, propylquinolizinyl, methylquinoxalinyl, methylbutylselenophenyl, methylthebenidinyl, dimethylthiazolyl, trimethylthiophenyl, dibutyltriphenodioxazinyl, dibutyltriphenodithiazinyl, dibutylxanthenyl, trimethylchromanyl, dimethylthiochromanyl, dimethylimidazolidinyl, dimethylindolinyl, dibutylisochromanyl, dibutylisothiochromanyl, phenylisoindolinyl, dibutylmorpholinyl, dimethylpiperazinyl, dimethylpiperidinyl, dimethylpyrozolidinyl, dimethylpyrrolidinyl, bipyridyl, pyrido[2,1,6-de]quinolizinyl, hexamethylquinuclidinyl, 5,7-dioxa-6-phosphadibenzo[a,c]cycloheptene-6-oxide, 9-oxa-10-phosphaphenanthrene-10-oxide and the like; from all isomers of polar groups including methoxy, ethoxy, propoxy, butoxy, pentoxy, phenoxy, dimethylphenoxy, dimethylamino, diethylamino, dipropylamino, methylethylamino, methylpropylamino, ethylpropylamino, diphenylamino, methylphenylamino, ethylphenylamino, and the like.

In some embodiments of the invention, it is preferred that at least one R¹¹ and/or at least one R¹² are, independently, methyl, ethyl, n-propyl, iso-propyl, n-butyl, sec-butyl, iso-butyl, tert-butyl, phenyl, napthyl, diphenylmethyl, or trifluoromethyl; more preferably at least one R¹¹ and one R¹² are, independently, methyl, ethyl, n-propyl, iso-propyl, n-butyl, sec-butyl, iso-butyl, tert-butyl, phenyl, napthyl, diphenylmethyl, or trifluoromethyl.

In some embodiments R¹⁰, R¹¹, R¹², and R¹³ on the same atom or adjacent atoms may join together to form a substituted or unsubstituted saturated, partially unsaturated or aromatic cyclic or polycyclic ring structure.

Preferred catecholate ligands, X, are selected from the ZETA CATACHOLATES which is defined to be all isomers of methylcatecholate, dimethylcatecholate, trimethylcatecholate, tetramethylcatecholate, dichlorodimethylcatecholate, chloromethylcatecholate, chlorodimethylcatecholate, chlorotrimethylcatecholate, dichloromethylcatecholate, methyltrichlorocatecholate, difluorodimethylcatecholate, fluoromethylcatecholate, fluorodimethylcatecholate, fluorotrimethylcatecholate, difluoromethylcatecholate, methyltrifluorocatecholate, dibromodimethylcatecholate, bromomethylcatecholate, bromodimethylcatecholate, bromotrimethylcatecholate, dibromomethylcatecholate, methyltribromocatecholate, diiododimethylcatecholate, iodomethylcatecholate, iododimethylcatecholate, iodotrimethylcatecholate, diiodomethylcatecholate, methyltriiodocatecholate, methylnitrocatecholate, dimethylnitrocatecholate, trimethylnitrocatecholate, dimethoxydimethylcatecholate, diethoxydimethylcatecholate, dimethyldipropoxycatecholate, dibutoxydimethylcatecholate, dimethyldipentyloxycatecholate, dihexyloxydimethylcatecholate, diheptyloxydimethylcatecholate, dimethyldioctyloxycatecholate, dimethyldinonyloxycatecholate, didecyloxydimethylcatecholate, dimethylmethoxycatecholate, dimethylethoxycatecholate, dimethylpropoxycatecholate, butoxydimethylcatecholate, dimethylpentyloxycatecholate, dimethylhexyloxycatecholate, dimethylheptyloxycatecholate, dimethyloctyloxycatecholate, dimethylnonyloxycatecholate, decyloxydimethylcatecholate, methylmethoxycatecholate, methylethoxycatecholate, methylpropoxycatecholate, butoxymethylcatecholate, methylpentyloxycatecholate, hexyloxymethylcatecholate, heptyloxymethylcatecholate, methyloctyloxycatecholate, methylnonyloxycatecholate, decyloxymethylcatecholate, methyltrimethoxycatecholate, methyltriethoxycatecholate, methyltripropoxycatecholate, methyltributoxycatecholate, methyltripentyloxycatecholate, methyltrihexyloxycatecholate, methyltriheptyloxycatecholate, methyltrioctyloxycatecholate, methyltrinonyloxycatecholate, methyltridecyloxycatecholate, dimethoxymethylcatecholate, diethoxymethylcatecholate, dipropoxymethylcatecholate, dibutoxymethylcatecholate, diipentyloxymethylcatecholate, dihexyloxymethylcatecholate, diheptyloxymethylcatecholate, dioctyloxymethylcatecholate, dinonyloxymethylcatecholate, didecyloxymethylcatecholate, methoxytrimethylcatecholate, ethoxytrimethylcatecholate, propoxytrimethylcatecholate, butoxytrimethylcatecholate, pentyloxytrimethylcatecholate, hexyloxytrimethylcatecholate, heptyloxytrimethylcatecholate, octyloxytrimethylcatecholate, nonyloxytrimethylcatecholate, decyloxytrimethylcatecholate, ethylcatecholate, diethylcatecholate, triethylcatecholate, tetraethylcatecholate, dichlorodiethylcatecholate, chloroethylcatecholate, chlorodiethylcatecholate, chlorotriethylcatecholate, dichloroethylcatecholate, ethyltrichlorocatecholate, difluorodiethylcatecholate, fluoroethylcatecholate, fluorodiethylcatecholate, fluorotriethylcatecholate, difluoroethylcatecholate, ethyltrifluorocatecholate, dibromodiethylcatecholate, bromoethylcatecholate, bromodiethylcatecholate, bromotriethylcatecholate, dibromoethylcatecholate, ethyltribromocatecholate, diiododiethylcatecholate, iodoethylcatecholate, iododiethylcatecholate, iodotriethylcatecholate, diiodoethylcatecholate, ethyltriiodocatecholate, ethylnitrocatecholate, diethylnitrocatecholate, triethylnitrocatecholate, dimethoxydiethylcatecholate, diethoxydiethylcatecholate, diethyldipropoxycatecholate, dibutoxydiethylcatecholate, diethyldipentyloxycatecholate, dihexyloxydiethylcatecholate, diheptyloxydiethylcatecholate, diethyldioctyloxycatecholate, diethyldinonyloxycatecholate, didecyloxydiethylcatecholate, diethylmethoxycatecholate, diethylethoxycatecholate, diethylpropoxycatecholate, butoxydiethylcatecholate, diethylpentyloxycatecholate, diethylhexyloxycatecholate, diethylheptyloxycatecholate, diethyloctyloxycatecholate, diethylnonyloxycatecholate, decyloxydiethylcatecholate, ethylmethoxycatecholate, ethylethoxycatecholate, ethylpropoxycatecholate, butoxyethylcatecholate, ethylpentyloxycatecholate, hexyloxyethylcatecholate, heptyloxyethylcatecholate, ethyloctyloxycatecholate, ethylnonyloxycatecholate, decyloxyethylcatecholate, ethyltrimethoxycatecholate, ethyltriethoxycatecholate, ethyltripropoxycatecholate, ethyltributoxycatecholate, ethyltripentyloxycatecholate, ethyltrihexyloxycatecholate, ethyltriheptyloxycatecholate, ethyltrioctyloxycatecholate, ethyltrinonyloxycatecholate, ethyltridecyloxycatecholate, dimethoxyethylcatecholate, diethoxyethylcatecholate, dipropoxyethylcatecholate, dibutoxyethylcatecholate, diipentyloxyethylcatecholate, dihexyloxyethylcatecholate, diheptyloxyethylcatecholate, dioctyloxyethylcatecholate, dinonyloxyethylcatecholate, didecyloxyethylcatecholate, methoxytriethylcatecholate, ethoxytriethylcatecholate, propoxytriethylcatecholate, butoxytriethylcatecholate, pentyloxytriethylcatecholate, hexyloxytriethylcatecholate, heptyloxytriethylcatecholate, octyloxytriethylcatecholate, nonyloxytriethylcatecholate, decyloxytriethylcatecholate, propylcatecholate, dipropylcatecholate, tripropylcatecholate, tetrapropylcatecholate, dichlorodipropylcatecholate, chloropropylcatecholate, chlorodipropylcatecholate, chlorotripropylcatecholate, dichloropropylcatecholate, propyltrichlorocatecholate, difluorodipropylcatecholate, fluoropropylcatecholate, fluorodipropylcatecholate, fluorotripropylcatecholate, difluoropropylcatecholate, propyltrifluorocatecholate, dibromodipropylcatecholate, bromopropylcatecholate, bromodipropylcatecholate, bromotripropylcatecholate, dibromopropylcatecholate, propyltribromocatecholate, diiododipropylcatecholate, iodopropylcatecholate, iododipropylcatecholate, iodotripropylcatecholate, diiodopropylcatecholate, propyltriiodocatecholate, propylnitrocatecholate, dipropylnitrocatecholate, tripropylnitrocatecholate, dimethoxydipropylcatecholate, diethoxydipropylcatecholate, dipropyldipropoxycatecholate, dibutoxydipropylcatecholate, dipropyldipentyloxycatecholate, dihexyloxydipropylcatecholate, diheptyloxydipropylcatecholate, dipropyldioctyloxycatecholate, dipropyldinonyloxycatecholate, didecyloxydipropylcatecholate, dipropylmethoxycatecholate, dipropylethoxycatecholate, dipropylpropoxycatecholate, butoxydipropylcatecholate, dipropylpentyloxycatecholate, dipropylhexyloxycatecholate, dipropylheptyloxycatecholate, dipropyloctyloxycatecholate, dipropylnonyloxycatecholate, decyloxydipropylcatecholate, propylmethoxycatecholate, propylethoxycatecholate, propylpropoxycatecholate, butoxypropylcatecholate, propylpentyloxycatecholate, hexyloxypropylcatecholate, heptyloxypropylcatecholate, propyloctyloxycatecholate, propylnonyloxycatecholate, decyloxypropylcatecholate, propyltrimethoxycatecholate, propyltriethoxycatecholate, propyltripropoxycatecholate, propyltributoxycatecholate, propyltripentyloxycatecholate, propyltrihexyloxycatecholate, propyltriheptyloxycatecholate, propyltrioctyloxycatecholate, propyltrinonyloxycatecholate, propyltridecyloxycatecholate, dimethoxypropylcatecholate, diethoxypropylcatecholate, dipropoxypropylcatecholate, dibutoxypropylcatecholate, diipentyloxypropylcatecholate, dihexyloxypropylcatecholate, diheptyloxypropylcatecholate, dioctyloxypropylcatecholate, dinonyloxypropylcatecholate, didecyloxypropylcatecholate, methoxytripropylcatecholate, ethoxytripropylcatecholate, propoxytripropylcatecholate, butoxytripropylcatecholate, pentyloxytripropylcatecholate, hexyloxytripropylcatecholate, heptyloxytripropylcatecholate, octyloxytripropylcatecholate, nonyloxytripropylcatecholate, decyloxytripropylcatecholate, butylcatecholate, dibutylcatecholate, tributylcatecholate, tetrabutylcatecholate, dichlorodibutylcatecholate, chlorobutylcatecholate, chlorodibutylcatecholate, chlorotributylcatecholate, dichlorobutylcatecholate, butyltrichlorocatecholate, difluorodibutylcatecholate, fluorobutylcatecholate, fluorodibutylcatecholate, fluorotributylcatecholate, difluorobutylcatecholate, butyltrifluorocatecholate, dibromodibutylcatecholate, bromobutylcatecholate, bromodibutylcatecholate, bromotributylcatecholate, dibromobutylcatecholate, butyltribromocatecholate, diiododibutylcatecholate, iodobutylcatecholate, iododibutylcatecholate, iodotributylcatecholate, diiodobutylcatecholate, butyltriiodocatecholate, butylnitrocatecholate, dibutylnitrocatecholate, tributylnitrocatecholate, dimethoxydibutylcatecholate, diethoxydibutylcatecholate, dibutyldipropoxycatecholate, dibutoxydibutylcatecholate, dibutyldipentyloxycatecholate, dihexyloxydibutylcatecholate, diheptyloxydibutylcatecholate, dibutyldioctyloxycatecholate, dibutyldinonyloxycatecholate, didecyloxydibutylcatecholate, dibutylmethoxycatecholate, dibutylethoxycatecholate, dibutylpropoxycatecholate, butoxydibutylcatecholate, dibutylpentyloxycatecholate, dibutylhexyloxycatecholate, dibutylheptyloxycatecholate, dibutyloctyloxycatecholate, dibutylnonyloxycatecholate, decyloxydibutylcatecholate, butylmethoxycatecholate, butylethoxycatecholate, butylpropoxycatecholate, butoxybutylcatecholate, butylpentyloxycatecholate, hexyloxybutylcatecholate, heptyloxybutylcatecholate, butyloctyloxycatecholate, butylnonyloxycatecholate, decyloxybutylcatecholate, butyltrimethoxycatecholate, butyltriethoxycatecholate, butyltripropoxycatecholate, butyltributoxycatecholate, butyltripentyloxycatecholate, butyltrihexyloxycatecholate, butyltriheptyloxycatecholate, butyltrioctyloxycatecholate, butyltrinonyloxycatecholate, butyltridecyloxycatecholate, dimethoxybutylcatecholate, diethoxybutylcatecholate, dipropoxybutylcatecholate, dibutoxybutylcatecholate, diipentyloxybutylcatecholate, dihexyloxybutylcatecholate, diheptyloxybutylcatecholate, dioctyloxybutylcatecholate, dinonyloxybutylcatecholate, didecyloxybutylcatecholate, methoxytributylcatecholate, ethoxytributylcatecholate, propoxytributylcatecholate, butoxytributylcatecholate, pentyloxytributylcatecholate, hexyloxytributylcatecholate, heptyloxytributylcatecholate, octyloxytributylcatecholate, nonyloxytributylcatecholate, decyloxytributylcatecholate, pentylcatecholate, dipentylcatecholate, tripentylcatecholate, tetrapentylcatecholate, dichlorodipentylcatecholate, chloropentylcatecholate, chlorodipentylcatecholate, chlorotripentylcatecholate, dichloropentylcatecholate, pentyltrichlorocatecholate, difluorodipentylcatecholate, fluoropentylcatecholate, fluorodipentylcatecholate, fluorotripentylcatecholate, difluoropentylcatecholate, pentyltrifluorocatecholate, dibromodipentylcatecholate, bromopentylcatecholate, bromodipentylcatecholate, bromotripentylcatecholate, dibromopentylcatecholate, pentyltribromocatecholate, diiododipentylcatecholate, iodopentylcatecholate, iododipentylcatecholate, iodotripentylcatecholate, diiodopentylcatecholate, pentyltriiodocatecholate, pentylnitrocatecholate, dipentylnitrocatecholate, tripentylnitrocatecholate, dimethoxydipentylcatecholate, diethoxydipentylcatecholate, dipentyldipropoxycatecholate, dibutoxydipentylcatecholate, dipentyldipentyloxycatecholate, dihexyloxydipentylcatecholate, diheptyloxydipentylcatecholate, dipentyldioctyloxycatecholate, dipentyldinonyloxycatecholate, didecyloxydipentylcatecholate, dipentylmethoxycatecholate, dipentylethoxycatecholate, dipentylpropoxycatecholate, butoxydipentylcatecholate, dipentylpentyloxycatecholate, dipentylhexyloxycatecholate, dipentylheptyloxycatecholate, dipentyloctyloxycatecholate, dipentylnonyloxycatecholate, decyloxydipentylcatecholate, pentylmethoxycatecholate, pentylethoxycatecholate, pentylpropoxycatecholate, butoxypentylcatecholate, pentylpentyloxycatecholate, hexyloxypentylcatecholate, heptyloxypentylcatecholate, pentyloctyloxycatecholate, pentylnonyloxycatecholate, decyloxypentylcatecholate, pentyltrimethoxycatecholate, pentyltriethoxycatecholate, pentyltripropoxycatecholate, pentyltributoxycatecholate, pentyltripentyloxycatecholate, pentyltrihexyloxycatecholate, pentyltriheptyloxycatecholate, pentyltrioctyloxycatecholate, pentyltrinonyloxycatecholate, pentyltridecyloxycatecholate, dimethoxypentylcatecholate, diethoxypentylcatecholate, dipropoxypentylcatecholate, dibutoxypentylcatecholate, diipentyloxypentylcatecholate, dihexyloxypentylcatecholate, diheptyloxypentylcatecholate, dioctyloxypentylcatecholate, dinonyloxypentylcatecholate, didecyloxypentylcatecholate, methoxytripentylcatecholate, ethoxytripentylcatecholate, propoxytripentylcatecholate, butoxytripentylcatecholate, pentyloxytripentylcatecholate, hexyloxytripentylcatecholate, heptyloxytripentylcatecholate, octyloxytripentylcatecholate, nonyloxytripentylcatecholate, decyloxytripentylcatecholate, hexylcatecholate, dihexylcatecholate, trihexylcatecholate, tetrahexylcatecholate, dichlorodihexylcatecholate, chlorohexylcatecholate, chlorodihexylcatecholate, chlorotrihexylcatecholate, dichlorohexylcatecholate, hexyltrichlorocatecholate, difluorodihexylcatecholate, fluorohexylcatecholate, fluorodihexylcatecholate, fluorotrihexylcatecholate, difluorohexylcatecholate, hexyltrifluorocatecholate, dibromodihexylcatecholate, bromohexylcatecholate, bromodihexylcatecholate, bromotrihexylcatecholate, dibromohexylcatecholate, hexyltribromocatecholate, diiododihexylcatecholate, iodohexylcatecholate, iododihexylcatecholate, iodotrihexylcatecholate, diiodohexylcatecholate, hexyltriiodocatecholate, hexylnitrocatecholate, dihexylnitrocatecholate, trihexylnitrocatecholate, dimethoxydihexylcatecholate, diethoxydihexylcatecholate, dihexyldipropoxycatecholate, dibutoxydihexylcatecholate, dihexyldipentyloxycatecholate, dihexyloxydihexylcatecholate, diheptyloxydihexylcatecholate, dihexyldioctyloxycatecholate, dihexyldinonyloxycatecholate, didecyloxydihexylcatecholate, dihexylmethoxycatecholate, dihexylethoxycatecholate, dihexylpropoxycatecholate, butoxydihexylcatecholate, dihexylpentyloxycatecholate, dihexylhexyloxycatecholate, dihexylheptyloxycatecholate, dihexyloctyloxycatecholate, dihexylnonyloxycatecholate, decyloxydihexylcatecholate, hexylmethoxycatecholate, hexylethoxycatecholate, hexylpropoxycatecholate, butoxyhexylcatecholate, hexylpentyloxycatecholate, hexyloxyhexylcatecholate, heptyloxyhexylcatecholate, hexyloctyloxycatecholate, hexylnonyloxycatecholate, decyloxyhexylcatecholate, hexyltrimethoxycatecholate, hexyltriethoxycatecholate, hexyltripropoxycatecholate, hexyltributoxycatecholate, hexyltripentyloxycatecholate, hexyltrihexyloxycatecholate, hexyltriheptyloxycatecholate, hexyltrioctyloxycatecholate, hexyltrinonyloxycatecholate, hexyltridecyloxycatecholate, dimethoxyhexylcatecholate, diethoxyhexylcatecholate, dipropoxyhexylcatecholate, dibutoxyhexylcatecholate, diipentyloxyhexylcatecholate, dihexyloxyhexylcatecholate, diheptyloxyhexylcatecholate, dioctyloxyhexylcatecholate, dinonyloxyhexylcatecholate, didecyloxyhexylcatecholate, methoxytrihexylcatecholate, ethoxytrihexylcatecholate, propoxytrihexylcatecholate, butoxytrihexylcatecholate, pentyloxytrihexylcatecholate, hexyloxytrihexylcatecholate, heptyloxytrihexylcatecholate, octyloxytrihexylcatecholate, nonyloxytrihexylcatecholate, decyloxytrihexylcatecholate, heptylcatecholate, diheptylcatecholate, triheptylcatecholate, tetraheptylcatecholate, dichlorodiheptylcatecholate, chloroheptylcatecholate, chlorodiheptylcatecholate, chlorotriheptylcatecholate, dichloroheptylcatecholate, heptyltrichlorocatecholate, difluorodiheptylcatecholate, fluoroheptylcatecholate, fluorodiheptylcatecholate, fluorotriheptylcatecholate, difluoroheptylcatecholate, heptyltrifluorocatecholate, dibromodiheptylcatecholate, bromoheptylcatecholate, bromodiheptylcatecholate, bromotriheptylcatecholate, dibromoheptylcatecholate, heptyltribromocatecholate, diiododiheptylcatecholate, iodoheptylcatecholate, iododiheptylcatecholate, iodotriheptylcatecholate, diiodoheptylcatecholate, heptyltriiodocatecholate, heptylnitrocatecholate, diheptylnitrocatecholate, triheptylnitrocatecholate, dimethoxydiheptylcatecholate, diethoxydiheptylcatecholate, diheptyldipropoxycatecholate, dibutoxydiheptylcatecholate, diheptyldipentyloxycatecholate, dihexyloxydiheptylcatecholate, diheptyloxydiheptylcatecholate, diheptyldioctyloxycatecholate, diheptyldinonyloxycatecholate, didecyloxydiheptylcatecholate, diheptylmethoxycatecholate, diheptylethoxycatecholate, diheptylpropoxycatecholate, butoxydiheptylcatecholate, diheptylpentyloxycatecholate, diheptylhexyloxycatecholate, diheptylheptyloxycatecholate, diheptyloctyloxycatecholate, diheptylnonyloxycatecholate, decyloxydiheptylcatecholate, heptylmethoxycatecholate, heptylethoxycatecholate, heptylpropoxycatecholate, butoxyheptylcatecholate, heptylpentyloxycatecholate, hexyloxyheptylcatecholate, heptyloxyheptylcatecholate, heptyloctyloxycatecholate, heptylnonyloxycatecholate, decyloxyheptylcatecholate, heptyltrimethoxycatecholate, heptyltriethoxycatecholate, heptyltripropoxycatecholate, heptyltributoxycatecholate, heptyltripentyloxycatecholate, heptyltrihexyloxycatecholate, heptyltriheptyloxycatecholate, heptyltrioctyloxycatecholate, heptyltrinonyloxycatecholate, heptyltridecyloxycatecholate, dimethoxyheptylcatecholate, diethoxyheptylcatecholate, dipropoxyheptylcatecholate, dibutoxyheptylcatecholate, diipentyloxyheptylcatecholate, dihexyloxyheptylcatecholate, diheptyloxyheptylcatecholate, dioctyloxyheptylcatecholate, dinonyloxyheptylcatecholate, didecyloxyheptylcatecholate, methoxytriheptylcatecholate, ethoxytriheptylcatecholate, propoxytriheptylcatecholate, butoxytriheptylcatecholate, pentyloxytriheptylcatecholate, hexyloxytriheptylcatecholate, heptyloxytriheptylcatecholate, octyloxytriheptylcatecholate, nonyloxytriheptylcatecholate, decyloxytriheptylcatecholate, octylcatecholate, dioctylcatecholate, trioctylcatecholate, tetraoctylcatecholate, dichlorodioctylcatecholate, chlorooctylcatecholate, chlorodioctylcatecholate, chlorotrioctylcatecholate, dichlorooctylcatecholate, octyltrichlorocatecholate, difluorodioctylcatecholate, fluorooctylcatecholate, fluorodioctylcatecholate, fluorotrioctylcatecholate, difluorooctylcatecholate, octyltrifluorocatecholate, dibromodioctylcatecholate, bromooctylcatecholate, bromodioctylcatecholate, bromotrioctylcatecholate, dibromooctylcatecholate, octyltribromocatecholate, diiododioctylcatecholate, iodooctylcatecholate, iododioctylcatecholate, iodotrioctylcatecholate, diiodooctylcatecholate, octyltriiodocatecholate, octylnitrocatecholate, dioctylnitrocatecholate, trioctylnitrocatecholate, dimethoxydioctylcatecholate, diethoxydioctylcatecholate, dioctyldipropoxycatecholate, dibutoxydioctylcatecholate, dioctyldipentyloxycatecholate, dihexyloxydioctylcatecholate, diheptyloxydioctylcatecholate, dioctyldioctyloxycatecholate, dioctyldinonyloxycatecholate, didecyloxydioctylcatecholate, dioctylmethoxycatecholate, dioctylethoxycatecholate, dioctylpropoxycatecholate, butoxydioctylcatecholate, dioctylpentyloxycatecholate, dioctylhexyloxycatecholate, dioctylheptyloxycatecholate, dioctyloctyloxycatecholate, dioctylnonyloxycatecholate, decyloxydioctylcatecholate, octylmethoxycatecholate, octylethoxycatecholate, octylpropoxycatecholate, butoxyoctylcatecholate, octylpentyloxycatecholate, hexyloxyoctylcatecholate, heptyloxyoctylcatecholate, octyloctyloxycatecholate, octylnonyloxycatecholate, decyloxyoctylcatecholate, octyltrimethoxycatecholate, octyltriethoxycatecholate, octyltripropoxycatecholate, octyltributoxycatecholate, octyltripentyloxycatecholate, octyltrihexyloxycatecholate, octyltriheptyloxycatecholate, octyltrioctyloxycatecholate, octyltrinonyloxycatecholate, octyltridecyloxycatecholate, dimethoxyoctylcatecholate, diethoxyoctylcatecholate, dipropoxyoctylcatecholate, dibutoxyoctylcatecholate, diipentyloxyoctylcatecholate, dihexyloxyoctylcatecholate, diheptyloxyoctylcatecholate, dioctyloxyoctylcatecholate, dinonyloxyoctylcatecholate, didecyloxyoctylcatecholate, methoxytrioctylcatecholate, ethoxytrioctylcatecholate, propoxytrioctylcatecholate, butoxytrioctylcatecholate, pentyloxytrioctylcatecholate, hexyloxytrioctylcatecholate, heptyloxytrioctylcatecholate, octyloxytrioctylcatecholate, nonyloxytrioctylcatecholate, decyloxytrioctylcatecholate, nonylcatecholate, dinonylcatecholate, trinonylcatecholate, tetranonylcatecholate, dichlorodinonylcatecholate, chlorononylcatecholate, chlorodinonylcatecholate, chlorotrinonylcatecholate, dichlorononylcatecholate, nonyltrichlorocatecholate, difluorodinonylcatecholate, fluorononylcatecholate, fluorodinonylcatecholate, fluorotrinonylcatecholate, difluorononylcatecholate, nonyltrifluorocatecholate, dibromodinonylcatecholate, bromononylcatecholate, bromodinonylcatecholate, bromotrinonylcatecholate, dibromononylcatecholate, nonyltribromocatecholate, diiododinonylcatecholate, iodononylcatecholate, iododinonylcatecholate, iodotrinonylcatecholate, diiodononylcatecholate, nonyltriiodocatecholate, nonylnitrocatecholate, dinonylnitrocatecholate, trinonylnitrocatecholate, dimethoxydinonylcatecholate, diethoxydinonylcatecholate, dinonyldipropoxycatecholate, dibutoxydinonylcatecholate, dinonyldipentyloxycatecholate, dihexyloxydinonylcatecholate, diheptyloxydinonylcatecholate, dinonyldioctyloxycatecholate, dinonyldinonyloxycatecholate, didecyloxydinonylcatecholate, dinonylmethoxycatecholate, dinonylethoxycatecholate, dinonylpropoxycatecholate, butoxydinonylcatecholate, dinonylpentyloxycatecholate, dinonylhexyloxycatecholate, dinonylheptyloxycatecholate, dinonyloctyloxycatecholate, dinonylnonyloxycatecholate, decyloxydinonylcatecholate, nonylmethoxycatecholate, nonylethoxycatecholate, nonylpropoxycatecholate, butoxynonylcatecholate, nonylpentyloxycatecholate, hexyloxynonylcatecholate, heptyloxynonylcatecholate, nonyloctyloxycatecholate, nonylnonyloxycatecholate, decyloxynonylcatecholate, nonyltrimethoxycatecholate, nonyltriethoxycatecholate, nonyltripropoxycatecholate, nonyltributoxycatecholate, nonyltripentyloxycatecholate, nonyltrihexyloxycatecholate, nonyltriheptyloxycatecholate, nonyltrioctyloxycatecholate, nonyltrinonyloxycatecholate, nonyltridecyloxycatecholate, dimethoxynonylcatecholate, diethoxynonylcatecholate, dipropoxynonylcatecholate, dibutoxynonylcatecholate, diipentyloxynonylcatecholate, dihexyloxynonylcatecholate, diheptyloxynonylcatecholate, dioctyloxynonylcatecholate, dinonyloxynonylcatecholate, didecyloxynonylcatecholate, methoxytrinonylcatecholate, ethoxytrinonylcatecholate, propoxytrinonylcatecholate, butoxytrinonylcatecholate, pentyloxytrinonylcatecholate, hexyloxytrinonylcatecholate, heptyloxytrinonylcatecholate, octyloxytrinonylcatecholate, nonyloxytrinonylcatecholate, decyloxytrinonylcatecholate, decylcatecholate, didecylcatecholate, tridecylcatecholate, tetradecylcatecholate, dichlorodidecylcatecholate, chlorodecylcatecholate, chlorodidecylcatecholate, chlorotridecylcatecholate, dichlorodecylcatecholate, decyltrichlorocatecholate, difluorodidecylcatecholate, fluorodecylcatecholate, fluorodidecylcatecholate, fluorotridecylcatecholate, difluorodecylcatecholate, decyltrifluorocatecholate, dibromodidecylcatecholate, bromodecylcatecholate, bromodidecylcatecholate, bromotridecylcatecholate, dibromodecylcatecholate, decyltribromocatecholate, diiododidecylcatecholate, iododecylcatecholate, iododidecylcatecholate, iodotridecylcatecholate, diiododecylcatecholate, decyltriiodocatecholate, decylnitrocatecholate, didecylnitrocatecholate, tridecylnitrocatecholate, dimethoxydidecylcatecholate, diethoxydidecylcatecholate, didecyldipropoxycatecholate, dibutoxydidecylcatecholate, didecyldipentyloxycatecholate, dihexyloxydidecylcatecholate, diheptyloxydidecylcatecholate, didecyldioctyloxycatecholate, didecyldinonyloxycatecholate, didecyloxydidecylcatecholate, didecylmethoxycatecholate, didecylethoxycatecholate, didecylpropoxycatecholate, butoxydidecylcatecholate, didecylpentyloxycatecholate, didecylhexyloxycatecholate, didecylheptyloxycatecholate, didecyloctyloxycatecholate, didecylnonyloxycatecholate, decyloxydidecylcatecholate, decylmethoxycatecholate, decylethoxycatecholate, decylpropoxycatecholate, butoxydecylcatecholate, decylpentyloxycatecholate, hexyloxydecylcatecholate, heptyloxydecylcatecholate, decyloctyloxycatecholate, decylnonyloxycatecholate, decyloxydecylcatecholate, decyltrimethoxycatecholate, decyltriethoxycatecholate, decyltripropoxycatecholate, decyltributoxycatecholate, decyltripentyloxycatecholate, decyltrihexyloxycatecholate, decyltriheptyloxycatecholate, decyltrioctyloxycatecholate, decyltrinonyloxycatecholate, decyltridecyloxycatecholate, dimethoxydecylcatecholate, diethoxydecylcatecholate, dipropoxydecylcatecholate, dibutoxydecylcatecholate, diipentyloxydecylcatecholate, dihexyloxydecylcatecholate, diheptyloxydecylcatecholate, dioctyloxydecylcatecholate, dinonyloxydecylcatecholate, didecyloxydecylcatecholate, methoxytridecylcatecholate, ethoxytridecylcatecholate, propoxytridecylcatecholate, butoxytridecylcatecholate, pentyloxytridecylcatecholate, hexyloxytridecylcatecholate, heptyloxytridecylcatecholate, octyloxytridecylcatecholate, nonyloxytridecylcatecholate, decyloxytridecylcatecholate, methoxycatecholate, ethoxycatecholate, propoxycatecholate, butoxymethylcatecholate, pentyloxycatecholate, hexyloxycatecholate, heptyloxycatecholate, octyloxycatecholate, nonyloxycatecholate, decyloxycatecholate, dimethoxycatecholate, diethoxycatecholate, dipropoxycatecholate, dibutoxymethylcatecholate, dipentyloxycatecholate, dihexyloxycatecholate, diheptyloxycatecholate, dioctyloxycatecholate, dinonyloxycatecholate, didecyloxycatecholate, trimethoxycatecholate, triethoxycatecholate, propoxycatecholate, butoxymethylcatecholate, tripentyloxycatecholate, trihexyloxycatecholate, triheptyloxycatecholate, trioctyloxycatecholate, trinonyloxycatecholate, tridecyloxycatecholate, butylethylmethypropylcatecholate, butylethylcatecholate, butylmethylcatecholate, butylpropylcatecholate, ethylmethylcatecholate, ethylpropylcatechlolate, methylpropylcatecholate, dibutyldiethylcatecholate, dibutyldimethylcatecholate, dibutyldipropylcatecholate, diethyldimethylcatecholate, diethyldipropylcatecholate, dimethyldipropylcatecholate, dibutylethylcatecholate, dibutylmethylcatecholate, dibutylpropylcatecholate, diethylmethylcatecholate, diethylpropylcatecholate, diethylbutylcatecholate, dimethylpropylcatecholate, dimethylethylcatecholate, dimethylbutylcatecholate, butylchloroethylcatecholate, butylchloromethylcatecholate, butylchloropropylcatecholate, ethylchloromethylcatecholate, ethylchloropropylcatechlolate, methylchloropropylcatecholate, butyldichloroethylcatecholate, butyldichloromethylcatecholate, butyldichloropropylcatecholate, ethyldichloromethylcatecholate, ethyldichloropropylcatechlolate, methyldichloropropylcatecholate, bromobutylethylcatecholate, bromobutylmethylcatecholate, bromobutylpropylcatecholate, bromoethylmethylcatecholate, bromoethylpropylcatechlolate, bromomethylpropylcatecholate, butyldibromoethylcatecholate, butyldibromomethylcatecholate, butyldibromopropylcatecholate, ethyldibromomethylcatecholate, ethyldibromopropylcatechlolate, methyldibromopropylcatecholate, dibutylcyclohexylcatecholate, dipropylcyclohexylcatecholate, diethylcyclohexylcatecholate, dimethylcyclohexylcatecholate, tributylcyclohexylcatecholate, tripropylcyclohexylcatecholate, triethylcyclohexylcatecholate, trimethylcyclohexylcatecholate, butylcyclohexylcatecholate, propylcyclohexylcatecholate, ethylcyclohexylcatecholate, methylcyclohexylcatecholate, butylpropylcyclohexylcatecholate, butylethylcyclohexylcatecholate, butylmethylcyclohexylcatecholate, propylethylcyclohexylcatecholate, propylmethylcyclohexylcatecholate, ethylmethylcyclohexylcatecholate, dibutylphenylcatecholate, dipropylphenylcatecholate, diethylphenylcatecholate, dimethylphenylcatecholate, tributylphenylcatecholate, tripropylphenylcatecholate, triethylphenylcatecholate, trimethylphenylcatecholate, butylphenylcatecholate, propylphenylcatecholate, ethylphenylcatecholate, methylphenylcatecholate, butylpropylphenylcatecholate, butylethylphenylcatecholate, butylmethylphenylcatecholate, propylethylphenylcatecholate, propylmethylphenylcatecholate, ethylmethylphenylcatecholate, phenylcatecholate, tetrachlorocatecholate, tetrabromocatecholate, tetrafluorocatecholate, tetraiodocatecholate, trichlorocatecholate, tribromocatecholate, trifluorocatecholate, triiodocatecholate, dichlorocatecholate, dibromocatecholate, difluorocatecholate, diiodocatecholate, chlorocatecholate, bromocatecholate, fluorocatecholate, iodocatecholate, methyldibenzo[1,4]dioxine-2,3-diolate, dimethyldibenzo[1,4]dioxine-2,3-diolate, trimethyldibenzo[1,4]dioxine-2,3-diolate, tetramethyldibenzo[1,4]dioxine-2,3-diolate, pentamethyldibenzo[1,4]dioxine-2,3-diolate, hexamethyldibenzo[1,4]dioxine-2,3-diolate, ethyldibenzo[1,4]dioxine-2,3-diolate, diethyldibenzo[1,4]dioxine-2,3-diolate, triethyldibenzo[1,4]dioxine-2,3-diolate, tetraethyldibenzo[1,4]dioxine-2,3-diolate, pentaethyldibenzo[1,4]dioxine-2,3-diolate, hexaethyldibenzo[1,4]dioxine-2,3-diolate, propyldibenzo[1,4]dioxine-2,3-diolate, dipropyldibenzo[1,4]dioxine-2,3-diolate, tripropyldibenzo[1,4]dioxine-2,3-diolate, tetrapropyldibenzo[1,4]dioxine-2,3-diolate, pentapropyldibenzo[1,4]dioxine-2,3-diolate, hexapropyldibenzo[1,4]dioxine-2,3-diolate, butyldibenzo[1,4]dioxine-2,3-diolate, dibutyldibenzo[1,4]dioxine-2,3-diolate, tributyldibenzo[1,4]dioxine-2,3-diolate, tetrabutyldibenzo[1,4]dioxine-2,3-diolate, pentabutyldibenzo[1,4]dioxine-2,3-diolate, hexabutyldibenzo[1,4]dioxine-2,3-diolate, pentyldibenzo[1,4]dioxine-2,3-diolate, dipentyldibenzo[1,4]dioxine-2,3-diolate, tripentyldibenzo[1,4]dioxine-2,3-diolate, tetrapentyldibenzo[1,4]dioxine-2,3-diolate, pentapentyldibenzo[1,4]dioxine-2,3-diolate, hexapentyldibenzo[1,4]dioxine-2,3-diolate, hexyldibenzo[1,4]dioxine-2,3-diolate, dihexyldibenzo[1,4]dioxine-2,3-diolate, trihexyldibenzo[1,4]dioxine-2,3-diolate, tetrahexyldibenzo[1,4]dioxine-2,3-diolate, pentahexyldibenzo[1,4]dioxine-2,3-diolate, hexahexyldibenzo[1,4]dioxine-2,3-diolate, heptyldibenzo[1,4]dioxine-2,3-diolate, diheptyldibenzo[1,4]dioxine-2,3-diolate, triheptyldibenzo[1,4]dioxine-2,3-diolate, tetraheptyldibenzo[1,4]dioxine-2,3-diolate, pentaheptyldibenzo[1,4]dioxine-2,3-diolate, hexaheptyldibenzo[1,4]dioxine-2,3-diolate, octyldibenzo[1,4]dioxine-2,3-diolate, dioctyldibenzo[1,4]dioxine-2,3-diolate, trioctyldibenzo[1,4]dioxine-2,3-diolate, tetraoctyldibenzo[1,4]dioxine-2,3-diolate, pentaoctyldibenzo[1,4]dioxine-2,3-diolate, hexaoctyldibenzo[1,4]dioxine-2,3-diolate, nonyldibenzo[1,4]dioxine-2,3-diolate, dinonyldibenzo[1,4]dioxine-2,3-diolate, trinonyldibenzo[1,4]dioxine-2,3-diolate, tetranonyldibenzo[1,4]dioxine-2,3-diolate, pentanonyldibenzo[1,4]dioxine-2,3-diolate, hexanonyldibenzo[1,4]dioxine-2,3-diolate, decyldibenzo[1,4]dioxine-2,3-diolate, didecyldibenzo[1,4]dioxine-2,3-diolate, tridecyldibenzo[1,4]dioxine-2,3-diolate, tetradecyldibenzo[1,4]dioxine-2,3-diolate, pentadecyldibenzo[1,4]dioxine-2,3-diolate, hexadecyldibenzo[1,4]dioxine-2,3-diolate, chlorodibenzo[1,4]dioxine-2,3-diolate, dichlorodibenzo[1,4]dioxine-2,3-diolate, trichlorodibenzo[1,4]dioxine-2,3-diolate, tetrachlorodiberizo[1,4]dioxine-2,3-diolate, pentachlorodibenzo[1,4]dioxine-2,3-diolate, hexachlorodibenzo[1,4]dioxine-2,3-diolate, bromomethyldibenzo[1,4]dioxine-2,3-diolate, dibromodibenzo[1,4]dioxine-2,3-diolate, tribromodibenzo[1,4]dioxine-2,3-diolate, tetrabromodibenzo[1,4]dioxine-2,3-diolate, pentabromodibenzo[1,4]dioxine-2,3-diolate, hexabromodibenzo[1,4]dioxine-2,3-diolate, bromomethyldibenzo[1,4]dioxine-2,3-diolate, bromodimethyldibenzo[1,4]dioxine-2,3-diolate, bromomethyltribenzo[1,4]dioxine-2,3-diolate, bromotetramethyldibenzo[1,4]dioxine-2,3-diolate, bromopentamethyldibenzo[1,4]dioxine-2,3-diolate, dibromomethyldibenzo[1,4]dioxine-2,3-diolate, dibromodimethyldibenzo [1,4]dioxine-2,3-diolate, dibromotrimethyldibenzo[1,4]dioxine-2,3-diolate, dibromotetramethyldibenzo[1,4]dioxine-2,3-diolate, tribromomethyldibenzo[1,4]dioxine-2,3-diolate, tribromodimethyldibenzo[1,4]dioxine-2,3-diolate, tribromotrimethyldibenzo[1,4]dioxine-2,3-diolate, tetrabromomethyldibenzo[1,4]dioxine-2,3-diolate, tetrabromodimethyldibenzo[1,4]dioxine-2,3-diolate, pentabromomethyldibenzo[1,4]dioxine-2,3-diolate, chloromethyldibenzo[1,4]dioxine-2,3-diolate, chlorodimethyldibenzo[1,4]dioxine-2,3-diolate, chloromethyltribenzo[1,4]dioxine-2,3-diolate, chlorotetramethyldibenzo[1,4]dioxine-2,3-diolate, chloropentamethyldibenzo[1,4]dioxine-2,3-diolate, dichloromethyldibenzo[1,4]dioxine-2,3-diolate, dichlorodimethyldibenzo[1,4]dioxine-2,3-diolate, dichlorotrimethyldibenzo[1,4]dioxine-2,3-diolate, dichlorotetramethyldibenzo[1,4]dioxine-2,3-diolate, trichloromethyldibenzo[1,4]dioxine-2,3-diolate, trichlorodimethyldibenzo[1,4]dioxine-2,3-diolate, trichlorotrimethyldibenzo[1,4]dioxine-2,3-diolate, tetrachloromethyldibenzo[1,4]dioxine-2,3-diolate, tetrachlorodimethyldibenzo[1,4]dioxine-2,3-diolate, pentachloromethyldibenzo[1,4]dioxine-2,3-diolate, bromoethyldibenzo[1,4]dioxine-2,3-diolate, bromodiethyldibenzo[1,4]dioxine-2,3-diolate, bromoethyltribenzo[1,4]dioxine-2,3-diolate, bromotetraethyldibenzo[1,4]dioxine-2,3-diolate, bromopentaethyldibenzo[1,4]dioxine-2,3-diolate, dibromoethyldibenzo[1,4]dioxine-2,3-diolate, dibromodiethyldibenzo[1,4]dioxine-2,3-diolate, dibromotriethyldibenzo[1,4]dioxine-2,3-diolate, dibromotetraethyldibenzo[1,4]dioxine-2,3-diolate, tribromoethyldibenzo[1,4]dioxine-2,3-diolate, tribromodiethyldibenzo[1,4]dioxine-2,3-diolate, tribromotriethyldibenzo[1,4]dioxine-2,3-diolate, tetrabromoethyldibenzo[1,4]dioxine-2,3-diolate, tetrabromodiethyldibenzo[1,4]dioxine-2,3-diolate, pentabromoethyldibenzo[1,4]dioxine-2,3-diolate, chloroethyldibenzo[1,4]dioxine-2,3-diolate, chlorodiethyldibenzo[1,4]dioxine-2,3-diolate, chloroethyltribenzo[1,4]dioxine-2,3-diolate, chlorotetraethyldibenzo[1,4]dioxine-2,3-diolate, chloropentaethyldibenzo[1,4]dioxine-2,3-diolate, dichloroethyldibenzo[1,4]dioxine-2,3-diolate, dichlorodiethyldibenzo[1,4]dioxine-2,3-diolate, dichlorotriethyldibenzo[1,4]dioxine-2,3-diolate, dichlorotetraethyldibenzo[1,4]dioxine-2,3-diolate, trichloroethyldibenzo[1,4]dioxine-2,3-diolate, trichlorodiethyldibenzo[1,4]dioxine-2,3-diolate, trichlorotriethyldibenzo[1,4]dioxine-2,3-diolate, tetrachloroethyldibenzo[1,4]dioxine-2,3-diolate, tetrachlorodiethyldibenzo[1,4]dioxine-2,3-diolate, pentachloroethyldibenzo[1,4]dioxine-2,3-diolate, bromopropyldibenzo[1,4]dioxine-2,3-diolate, bromodipropyldibenzo[1,4]dioxine-2,3-diolate, bromopropyltribenzo[1,4]dioxine-2,3-diolate, bromotetrapropyldibenzo[1,4]dioxine-2,3-diolate, bromopentapropyldibenzo[1,4]dioxine-2,3-diolate, dibromopropyldibenzo[1,4]dioxine-2,3-diolate, dibromodipropyldibenzo[1,4]dioxine-2,3-diolate, dibromotripropyldibenzo[1,4]dioxine-2,3-diolate, dibromotetrapropyldibenzo[1,4]dioxine-2,3-diolate, tribromopropyldibenzo[1,4]dioxine-2,3-diolate, tribromodipropyldibenzo[1,4]dioxine-2,3-diolate, tribromotripropyldibenzo[1,4]dioxine-2,3-diolate, tetrabromopropyldibenzo[1,4]dioxine-2,3-diolate, tetrabromodipropyldibenzo[1,4]dioxine-2,3-diolate, pentabromopropyldibenzo[1,4]dioxine-2,3-diolate, chloropropyldibenzo[1,4]dioxine-2,3-diolate, chlorodipropyldibenzo[1,4]dioxine-2,3-diolate, chloropropyltribenzo[1,4]dioxine-2,3-diolate, chlorotetrapropyldibenzof[1,4]dioxine-2,3-diolate, chloropentapropyldibenzo[1,4]dioxine-2,3-diolate, dichloropropyldibenzo[1,4]dioxine-2,3-diolate, dichlorodipropyldibenzo[1,4]dioxine-2,3-diolate, dichlorotripropyldibenzo[1,4]dioxine-2,3-diolate, dichlorotetrapropyldibenzo[1,4]dioxine-2,3-diolate, trichloropropyldibenzo[1,4]dioxine-2,3-diolate, trichlorodipropyldibenzo[1,4]dioxine-2,3-diolate, trichlorotripropyldibenzo[1,4]dioxine-2,3-diolate, tetrachloropropyldibenzo[1,4]dioxine-2,3-diolate, tetrachlorodipropyldibenzo[1,4]dioxine-2,3-diolate, pentachloropropyldibenzo[1,4]dioxine-2,3-diolate, bromobutyldibenzo[1,4]dioxine-2,3-diolate, bromodibutyldibenzo[1,4]dioxine-2,3-diolate, bromobutyltribenzo[1,4]dioxine-2,3-diolate, bromotetrabutyldibenzo[1,4]dioxine-2,3-diolate, bromopentabutyldibenzo[1,4]dioxine-2,3-diolate, dibromobutyldibenzo[1,4]dioxine-2,3-diolate, dibromodibutyldibenzo[1,4]dioxine-2,3-diolate, dibromotributyldibenzo[1,4]dioxine-2,3-diolate, dibromotetrabutyldibenzo[1,4]dioxine-2,3-diolate, tribromobutyldibenzo[1,4]dioxine-2,3-diolate, tribromodibutyldibenzo[1,4]dioxine-2,3-diolate, tribromotributyldibenzo[1,4]dioxine-2,3-diolate, tetrabromobutyldibenzo[1,4]dioxine-2,3-diolate, tetrabromodibutyldibenzo[1,4]dioxine-2,3-diolate, pentabromobutyldibenzo[1,4]dioxine-2,3-diolate, chlorobutyldibenzo[1,4]dioxine-2,3-diolate, chlorodibutyldibenzo[1,4]dioxine-2,3-diolate, chlorobutyltribenzo[1,4]dioxine-2,3-diolate, chlorotetrabutyldibenzo[1,4]dioxine-2,3-diolate, chloropentabutyldibenzo[1,4]dioxine-2,3-diolate, dichlorobutyldibenzo[1,4]dioxine-2,3-diolate, dichlorodibutyldibenzo[1,4]dioxine-2,3-diolate, dichlorotributyldibenzo [1,4]dioxine-2,3-diolate, dichlorotetrabutyldibenzo[1,4]dioxine-2,3-diolate, trichlorobutyldibenzo[1,4]dioxine-2,3-diolate, trichlorodibutyldibenzo[1,4]dioxine-2,3-diolate, trichlorotributyldibenzo[1,4]dioxine-2,3-diolate, tetrachlorobutyldibenzo[1,4]dioxine-2,3-diolate, tetrachlorodibutyldibenzo[1,4]dioxine-2,3-diolate, pentachlorobutyldibenzo[1,4]dioxine-2,3-diolate, naphthalene-2,3-diolate, and phenanthrene-9,10-diolate.

Most preferred catecholate ligands, X, are selected from the group THETA-CATACHOLATES which is defined to be: 3,6-di-tert-butylcatecholate, 3,6-di-tert-butyl-4-chlorocatecholate, 3,6-di-tert-butyl-4,5-dichlorocatecholate, 3,6-di-tert-butyl-4-bromocatecholate, 3,6-di-tert-butyl-4,5-dibromocatecholate, 3,6-di-tert-butyl-4-fluorocatecholate, 3,6-di-tert-butyl-4,5-difluorocatecholate, 3,6-di-tert-butyl-4-methoxycatecholate, 3,6-di-tert-butyl-4,5-dimethoxycatecholate, 3,6-di-tert-butyl-4-ethoxycatecholate, 3,6-di-tert-butyl4,5-diethoxycatecholate, 3,6-di-tert-butyl-4-propoxycatecholate, 3,6-di-tert-butyl-4,5-dipropoxycatecholate, 3,6-di-tert-butyl-4-butoxycatecholate, 3,6-di-tert-butyl-4,5-dibutoxycatecholate, 3,6-di-tert-butyl-4-iso-propylcatecholate, 3,6-di-tert-butyl-4,5-di-isopropylcatecholate, 3,6-di-tert-butyl-4-cyclohexylcatecholate, 3,5-di-tert-butylcatecholate, 3,5-di-tert-butyl-6-chlorocatecholate, 3,5-di-tert-butyl-6-bromocatecholate, 3,5-di-tert-butyl-6-fluorocatecholate, 3,5-di-tert-butyl-6-nitrocatecholate, 3,4,6-tri-isopropylcatecholate, 3,4,5,6-tetra-isopropylcatecholate, 3,6-di-isopropylcatecholate, 1,4,6,8-tetra-tert-butyldibenzo[1,4]dioxine-2,3-diolate, 1,4,6,7,8,9-hexachlorodibenzo[1,4]dioxine-2,3-diolate, 1,4,6,7,8,9-hexabromodibenzo[1,4]dioxine-2,3-diolate, 3,6-di-n-butylcatecholate, 3,6-di-n-butyl-4-chlorocatecholate, 3,6-di-n-butyl-4,5-dichlorocatecholate, 3,6-di-n-butyl-4-bromocatecholate, 3,6-di-n-butyl-4,5-dibromocatecholate, 3,6-di-n-butyl-4-fluorocatecholate,3,6-di-n-butyl-4,5-difluorocatecholate, 3,6-di-n-butyl-4-methoxycatecholate,3,6-di-n-butyl-4,5-dimethoxycatecholate, 3,6-di-n-butyl-4-ethoxycatecholate, 3,6-di-n-butyl-4,5-diethoxycatecholate, 3,6-di-n-butyl-4-propoxycatecholate, 3,6-di-n-butyl-4,5-dipropoxycatecholate, 3,6-di-n-butyl-4-butoxycatecholate, 3,6-di-n-butyl-4,5-dibutoxycatecholate, 3,6-di-n-butyl-4-isopropylcatecholate, 3,6-di-n-butyl-4,5-di-isopropylcatecholate, 3,6-di-n-butyl-4-cyclohexylcatecholate, 3,5-di-n-butylcatecholate, 3,5-di-n-butyl-6-chlorocatecholate, 3,5-di-n-butyl-6-bromocatecholate, 3,5-di-n-butyl-6-fluorocatecholate, 3,5-di-n-butyl-6-nitrocatecholate, 3,6-di-iso-butylcatecholate, 3,6-di-iso-butyl-4-chlorocatecholate, 3,6-di-iso-butyl-4,5-dichlorocatecholate,3,6-di-iso-butyl-4-bromocatecholate, 3,6-di-iso-butyl-4,5-dibromocatecholate, 3,6-di-iso-butyl-4-fluorocatecholate, 3,6-di-iso-butyl-4,5-difluorocatecholate, 3,6-di-iso-butyl-4-methoxycatecholate, 3,6-di-iso-butyl-4,5-dimethoxycatecholate, 3,6-di-iso-butyl-4-ethoxycatecholate, 3,6-di-iso-butyl-4,5-diethoxycatecholate, 3,6-di-iso-butyl-4-propoxycatecholate, 3,6-di-iso-butyl-4,5-dipropoxycatecholate, 3,6-di-iso-butyl-4-butoxycatecholate, 3,6-di-iso-butyl-4,5-dibutoxycatecholate, 3,6-di-iso-butyl-4-isopropylcatecholate, 3,6-di-iso-butyl-4,5-di-isopropylcatecholate, 3,6-di-iso-butyl-4-cyclohexylcatecholate, 3,5-di-iso-butylcatecholate, 3,5-di-iso-butyl-6-chlorocatecholate, 3,5-di-iso-butyl-6-bromocatecholate, 3,5-di-iso-butyl-6-fluorocatecholate, 3,5-di-iso-butyl-6-nitrocatecholate, 3,4,6-tri-n-propylcatecholate, 3,6-di-isopropyl-4-chlorocatecholate, 3,6-di-isopropyl-4,5-dichlorocatecholate, 3,6-di-isopropyl-4-bromocatecholate, 3,6-di-isopropyl-4,5-dibromocatecholate, 3,6-di-isopropyl-4-fluorocatecholate, 3,6-di-isopropyl-4,5-difluorocatecholate, 3,6-di-isopropyl4-methyoxycatecholate, 3,6-di-isopropyl-4,5-dimethoxycatecholate, 3,6-di-isopropyl-4-ethyoxycatecholate, 3,6-di-isopropyl-4,5-diethoxycatecholate, 3,6-di-isopropyl-4-propoxycatecholate, 3,6-di-isopropyl-4,5-dipropoxycatecholate, 3,6-di-isopropyl-4-butoxycatecholate, 3,6-di-isopropyl-4,5-dibutoxycatecholate, 3,6-di-isopropyl-4-cyclohexylcatecholate, 3,6-dimethyl-4-chlorocatecholate, 3,6-dimethyl-4,5-dichlorocatecholate, 3,6-diisopropyl-4-bromocatecholate, 3,6-dimethyl-4,5-dibromocatecholate, 3,6-dimethyl-4-fluorocatecholate, 3,6-dimethyl-4,5-difluorocatecholate, 3,6-dimethyl-4-methyoxycatecholate, 3,6-dimethyl-4,5-dimethoxycatecholate, 3,6-dimethyl-4-ethyoxycatecholate, 3,6-dimethyl-4,5-diethoxycatecholate, 3,6-dimethyl-4-propoxycatecholate, 3,6-dimethyl-4,5-dipropoxycatecholate, 3,6-dimethyl-4-butoxycatecholate, 3,6-dimethyl-4,5-dibutoxycatecholate, 3,5-di-isopropylcatecholate, 3,6-di-n-propylcatecholate, 3,5-di-n-propylcatecholate, 3,6-dimethylcatecholate, 3,5-dimethylcatecholate, 4-methylcatecholate, naphthalene-2,3-diolate, and phenanthrene-9,10-diolate.

In some embodiments of the invention, the ligand structure, L*1, may be represented by the following structures:

where R¹ is, independently, a bulky hydrocarbyl, substituted bulky hydrocarbyl, bulky halocarbyl, or substituted bulky halocarbyl; R² is, independently, hydrogen, or a hydrocarbyl, substituted hydrocarbyl, halocarbyl, or substituted halocarbyl provided that a substituted hydrocarbyl is not substituted with trihydrocarbylsiloxy (e.g. —OSiMe₃).

In some embodiments of the invention, the catalyst precursor is represented by the formula L*1-MX, where M is a Group 3-11 transition metal, preferably a Group 8, 9, 10, or 11 transition metal, more preferably Fe, Co, Ni, or Pd, and even more preferably Ni or Pd; X is a substituted or unsubstituted catecholate ligand provided that the substituted catecholate ligand does not contain a 1,2-diketone functionality; and L*1 is ligand represented by the general formula, L*1,

where N is nitrogen, R¹ is, independently, a bulky hydrocarbyl, substituted bulky hydrocarbyl, bulky halocarbyl, or substituted bulky halocarbyl; and R² is, independently, hydrogen, or a hydrocarbyl, substituted hydrocarbyl, halocarbyl, or substituted halocarbyl provided that a substituted hydrocarbyl is not substituted with trihydrocarbylsiloxy (e.g. —OSiMe₃), and optionally both R² may join together to form a substituted or unsubstituted, saturated, partially unsaturated or aromatic cyclic or polycyclic ring structure.

Preferred L*1 ligands are those with R², independently, being hydrogen, methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, undecyl, dodecyl, phenyl, and pyridyl. Also preferred is when L*1 takes on the formulas represented by L*1a through L*1i. Most preferred are R², independently, being hydrogen, methyl, ethyl, propyl, or phenyl, and where L*1 is of structures L*1d, L*1b and L*1e.

Preferred R¹ substituents are, independently, of formulae S1 through S31, with S1, S7 and S16 being most preferred.

In another preferred embodiment catalysts precursors are represented by the formula: TMC Formula 1:

where M is a Group 3-11 transition metal, preferably a Group 8, 9, 10, or 11 transition metal, more preferably, Fe, Co, Ni, or Pd, and even more preferably Ni or Pd;

-   N is nitrogen; -   R¹ is, independently, a bulky hydrocarbyl, substituted hydrocarbyl,     halocarbyl, or substituted halocarbyl substituent, and is preferably     described by formulae S1 through S31, and most preferably described     by formulae S1, S7 and S16; -   R² is, independently, hydrogen, or a hydrocarbyl, substituted     hydrocarbyl, halocarbyl, or substituted halocarbyl substituent     provided that a substituted hydrocarbyl is not substituted with     trihydrocarbylsiloxy; and optionally both R² may join together to     form a substituted or unsubstituted, saturated, partially     unsaturated or aromatic cyclic or polycyclic ring structure; and -   X is a substituted or unsubstituted catecholate ligand provided that     the substituted catecholate ligand does not contain a 1,2-diketone     functionality.

Preferred R² are, independently, hydrogen, methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, undecyl, dodecyl, phenyl, and pyridyl, with hydrogen, methyl, ethyl, propyl, or phenyl being most preferred; or both R² join together to form a substituted or unsubstituted saturated, partially unsaturated or aromatic cyclic or polycyclic ring structure, with acenaphthylene, [1,4]-dithiane, piperazine, 1,4-dimethylpiperazine, bicyclo[2.2.1]heptane, 1,4-dimethyl[1,4]diazepane, methylcyclopentane, methyltetrahydrofuran, and methyldihydroftiran being the preferred ring structures, and with acenaphthylene being the most preferred ring structure.

More preferably, the catalyst precurosr is represented by the following structure: TMC Formula 2:

where M is a Group 8, 9, 10, or 11 transition metal, preferably, Fe, Co, Ni, or Pd, and even more preferably Ni or Pd;

-   N is nitrogen; -   O is oxygen; -   R² is, independently, hydrogen, or a hydrocarbyl, substituted     hydrocarbyl, halocarbyl, or substituted halocarbyl substituent     provided that a substituted hydrocarbyl is not substituted with     trihydrocarbylsiloxy, and optionally both R² may join together to     form a substituted or unsubstituted, saturated, partially     unsaturated or aromatic cyclic or polycyclic ring structure; -   R¹¹, R¹², and R¹³ are, independently, hydrogen, hydrocarbyl     radicals, substituted hydrocarbyl radicals, halocarbyl radicals,     substituted halocarbyl radicals, silylcarbyl radicals or polar     radicals, and optionally, R¹¹, R¹², and/or two or more R¹³ on     adjacent atoms may join together to form a substituted or     unsubstituted saturated, partially unsaturated or aromatic cyclic or     polycyclic ring structure; and -   R^(a), R^(b), R^(c) and R^(d) are, independently, hydrogen,     hydrocarbyl, substituted hydrocarbyl, halocarbyl or substituted     halocarbyl, and optionally two or more adjacent R^(a), R^(b), R^(c)     and/or R^(d) may join together to form a substituted or     unsubstituted, saturated, partially unsaturated, or aromatic cyclic     or polycyclic substituent.

Some invention embodiments, independently, select R^(a), R^(b), R^(c) and R^(d) from hydrogen, methyl, ethyl, ethenyl, ethynyl and all isomers of propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, nonadecyl, eicosyl, heneicosyl, docosyl, tricosyl, tetracosyl, pentacosyl, hexacosyl, heptacosyl, octacosyl, nonacosyl, triacontyl, propenyl, butenyl, pentenyl, hexenyl, heptenyl, octenyl, nonenyl, decenyl, undecenyl, dodecenyl, tridecenyl, tetradecenyl, pentadecenyl, hexadecenyl, heptadecenyl, octadecenyl, nonadecenyl, eicosenyl, heneicosenyl, docosenyl, tricosenyl, tetracosenyl, pentacosenyl, hexacosenyl, heptacosenyl, octacosenyl, nonacosenyl, triacontenyl, propynyl, butynyl, pentynyl, hexynyl, heptynyl, octynyl, nonynyl, decynyl, undecynyl, dodecynyl, tridecynyl, tetradecynyl, pentadecynyl, hexadecynyl, heptadecynyl, octadecynyl, nonadecynyl, eicosynyl, heneicosynyl, docosynyl, tricosynyl, tetracosynyl, pentacosynyl, hexacosynyl, heptacosynyl, octacosynyl, nonacosynyl, and triacontynyl, phenyl, napthyl, anthracenyl, pyrenyl, biphenyl, benzyl, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, cyclononyl, cyclodecyl, cycloundecyl, cyclododecyl, fluoro, chloro, bromo, iodo, trimethylsilyl, triethylsilyl, tripropylsilyl, dimethylethylsilyl, diethylmethylsilyl, trimethoxysilyl, tirethoxysilyl, tripropoxysilyl, methoxy, ethoxy, propoxy, butoxy, phenoxy, or a nitro, carboxylic acid, ester, ketone (excluding 1,2-diketones) or aldehyde group.

Some invention embodiments prefer that at least one R^(a), R^(b), R^(c) or R^(d) is not hydrogen.

Some invention embodiments select two or more adjacent R^(a), R^(b), R^(c) and/or R^(d) to join together to form a substituted or unsubstituted, saturated, partially unsaturated, or aromatic cyclic or polycyclic substituent. Preferred structures of this type are represented by formulae X1 through X52.

Some invention embodiments, independently, select R¹⁰, R¹¹, R¹², and R¹³ from hydrogen or hydrocarbyl radicals including methyl, ethyl, ethenyl, ethynyl and all isomers of propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, nonadecyl, eicosyl, heneicosyl, docosyl, tricosyl, tetracosyl, pentacosyl, hexacosyl, heptacosyl, octacosyl, nonacosyl, triacontyl, propenyl, butenyl, pentenyl, hexenyl, heptenyl, octenyl, nonenyl, decenyl, undecenyl, dodecenyl, tridecenyl, tetradecenyl, pentadecenyl, hexadecenyl, heptadecenyl, octadecenyl, nonadecenyl, eicosenyl, heneicosenyl, docosenyl, tricosenyl, tetracosenyl, pentacosenyl, hexacosenyl, heptacosenyl, octacosenyl, nonacosenyl, triacontenyl, propynyl, butynyl, pentynyl, hexynyl, heptynyl, octynyl, nonynyl, decynyl, undecynyl, dodecynyl, tridecynyl, tetradecynyl, pentadecynyl, hexadecynyl, heptadecynyl, octadecynyl, nonadecynyl, eicosynyl, heneicosynyl, docosynyl, tricosynyl, tetracosynyl, pentacosynyl, hexacosynyl, heptacosynyl, octacosynyl, nonacosynyl, and triacontynyl; from halocarbyls and all isomers of halocarbyls including perfluoropropyl, perfluorobutyl, perfluoropentyl, perfluorohexyl, perfluoroheptyl, perfluorooctyl, perfluorononyl, perfluorodecyl, perfluoroundecyl, perfluorododecyl, perfluorotridecyl, perfluorotetradecyl, perfluoropentadecyl, perfluorohexadecyl, perfluoroheptadecyl, perfluorooctadecyl, perfluorononadecyl, perfluoroeicosyl, perfluoroheneicosyl, perfluorodocosyl, perfluorotricosyl, perfluorotetracosyl, perfluoropentacosyl, perfluorohexacosyl, perfluoroheptacosyl, perfluorooctacosyl, perfluorononacosyl, perfluorotriacontyl, perfluorobutenyl, perfluorobutynyl, fluoropropyl, fluorobutyl, fluoropentyl, fluorohexyl, fluoroheptyl, fluorooctyl, fluorononyl, fluorodecyl, fluoroundecyl, fluorododecyl, fluorotridecyl, fluorotetradecyl, fluoropentadecyl, fluorohexadecyl, fluoroheptadecyl, fluorooctadecyl, fluorononadecyl, fluoroeicosyl, fluoroheneicosyl, fluorodocosyl, fluorotricosyl, fluorotetracosyl, fluoropentacosyl, fluorohexacosyl, fluoroheptacosyl, fluorooctacosyl, fluorononacosyl, fluorotriacontyl, difluorobutyl, trifluorobutyl, tetrafluorobutyl, pentafluorobutyl, hexafluorobutyl, heptafluorobutyl, octafluorobutyl; from substituted hydrocarbyl radicals and all isomers of substituted hydrocarbyl radicals including methoxypropyl, methoxybutyl, methoxypentyl, methoxyhexyl, methoxyheptyl, methoxyoctyl, methoxynonyl, methoxydecyl, methoxyundecyl, methoxydodecyl, methoxytridecyl, methoxytetradecyl, methoxypentadecyl, methoxyhexadecyl, methoxyheptadecyl, methoxyoctadecyl, methoxynonadecyl, methoxyeicosyl, methoxyheneicosyl, methoxydocosyl, methoxytricosyl, methoxytetracosyl, methoxypentacosyl, methoxyhexacosyl, methoxyheptacosyl, methoxyoctacosyl, methoxynonacosyl, methoxytriacontyl, butoxypropyl, butoxybutyl, butoxypentyl, butoxyhexyl, butoxyheptyl, butoxyoctyl, butoxynonyl, butoxydecyl, butoxyundecyl, butoxydodecyl, butoxytridecyl, butoxytetradecyl, butoxypentadecyl, butoxyhexadecyl, butoxyheptadecyl, butoxyoctadecyl, butoxynonadecyl, butoxyeicosyl, butoxyheneicosyl, butoxydocosyl, butoxytricosyl, butoxytetracosyl, butoxypentacosyl, butoxyhexacosyl, butoxyheptacosyl, butoxyoctacosyl, butoxynonacosyl, butoxytriacontyl, dimethylaminopropyl, dimethylaminobutyl, dimethylaminopentyl, dimethylaminohexyl, dimethylaminoheptyl, dimethylaminooctyl, dimethylaminononyl, dimethylaminodecyl, dimethylaminoundecyl, dimethylaminododecyl, dimethylaminotridecyl, dimethylaminotetradecyl, dimethylaminopentadecyl, dimethylaminohexadecyl, dimethylaminoheptadecyl, dimethylaminooctadecyl, dimethylaminononadecyl, dimethylaminoeicosyl, dimethylaminoheneicosyl, dimethylaminodocosyl, dimethylaminotricosyl, dimethylaminotetracosyl, dimethylaminopentacosyl, dimethylaminohexacosyl, dimethylaminoheptacosyl, dimethylaminooctacosyl, dimethylaminononacosyl, dimethylaminotriacontyl, trimethylsilyipropyl, trimethylsilylbutyl, trimethylsilylpentyl, trimethylsilylhexyl, trimethylsilylheptyl, trimethylsilyloctyl, trimethylsilylnonyl, trimethylsilyldecyl, trimethylsilylundecyl, trimethylsilyldodecyl, trimethylsilyltridecyl, trimethylsilyltetradecyl, trimethylsilylpentadecyl, trimethylsilylhexadecyl, trimethylsilylheptadecyl, trimethylsilyloctadecyl, trimethylsilylnonadecyl, trimethylsilyleicosyl, trimethylsilylheneicosyl, trimethylsilyldocosyl, trimethylsilyltricosyl, trimethylsilyltetracosyl, trimethylsilylpentacosyl, trimethylsilylhexacosyl, trimethylsilylheptacosyl, trimethylsilyloctacosyl, trimethylsilylnonacosyl, trimethylsilyltriacontyl and the like; from phenyl, and all isomers of hydrocarbyl substituted phenyl including methylphenyl, dimethylphenyl, trimethylphenyl, tetramethylphenyl, pentamethylphenyl ethylphenyl, diethylphenyl, triethylphenyl, tetraethylphenyl, pentaethylphenyl, propylphenyl, dipropylphenyl, tripropylphenyl, tetrapropylphenyl, pentapropylphenyl butylphenyl, dibutylphenyl, tributylphenyl, tetrabutylphenyl, pentabutylphenyl, hexylphenyl, dihexylphenyl, trihexylphenyl, tetrahexylphenyl, pentahexylphenyl, dimethylethylphenyl, dimethylpropylphenyl, dimethylbutylphenyl, dimethylpentylphenyl, dimethylhexylphenyl, diethylmethylphenyl, diethylpropylphenyl, diethylbutylphenyl, diethylpentylphenyl, diethylhexylphenyl, dipropylmethylphenyl, dipropylethylphenyl, dipropylbutylphenyl, dipropylpentylphenyl, dipropylhexylphenyl, dibutylmethylphenyl, dibutylethylphenyl, dibutylpropylphenyl, dibutylpentylphenyl, dibutylhexylphenyl, methylethylphenyl, methylpropylphenyl, methylbutylphenyl, methylpentylphenyl, methylhexylphenyl, ethylpropylphenyl, ethylbutylphenyl, ethylpentylphenyl, ethylhexylphenyl, propylbutylphenyl, propylpentylphenyl, propylhexylphenyl, butylpentylphenyl, butylhexylphenyl, trimethylsilylphenyl, trimethylgermylphenyl, trifluoromethylphenyl, bis(triflouromethyl)phenyl and the like; from all isomers of halo substituted phenyl (where halo is, independently, fluoro, chloro, bromo and iodo) including halophenyl, dihalophenyl, trihalophenyl, tetrahalophenyl, and pentahalophenyl; from all isomers of halo substituted hydrocarbyl substituted phenyl (where halo is, independently, fluoro, chloro, bromo and iodo) including halomethylphenyl, dihalomethylphenyl, trihalomethylphenyl, tetrahalomethylphenyl, haloethlyphenyl, dihaloethylphenyl, trihaloethylphenyl, tetrahaloethylphenyl, halopropylphenyl, dihalopropylphenyl, trihalopropylphenyl, tetrahalopropylphenyl, halobutylphenyl, dihalobutylphenyl, trihalobutylphenyl, tetrahalobutylphenyl, dihalodimethylphenyl, dihalo(trifluoromethyl)phenyl and the like; from all isomers of benzyl, and all isomers of hydrocarbyl substituted benzyl including methylbenzyl, dimethylbenzyl, trimethylbenzyl, tetramethylbenzyl, pentamethylbenzyl ethylbenzyl, diethylbenzyl, triethylbenzyl, tetraethylbenzyl, pentaethylbenzyl, propylbenzyl, dipropylbenzyl, tripropylbenzyl, tetrapropylbenzyl, pentapropylbenzyl butylbenzyl, dibutylbenzyl, tributylbenzyl, tetrabutylbenzyl, pentabutylbenzyl, hexylbenzyl, dihexylbenzyl, trihexylbenzyl, tetrahexylbenzyl, pentahexylbenzyl, dimethylethylbenzyl, dimethylpropylbenzyl, dimethylbutylbenzyl, dimethylpentylbenzyl, dimethylhexylbenzyl, diethylmethylbenzyl, diethylpropylbenzyl, diethylbutylbenzyl, diethylpentylbenzyl, diethylhexylbenzyl, dipropylmethylbenzyl, dipropylethylbenzyl, dipropylbutylbenzyl, dipropylpentylbenzyl, dipropylhexylbenzyl, dibutylmethylbenzyl, dibutylethylbenzyl, dibutylpropylbenzyl, dibutylpentylbenzyl, dibutylhexylbenzyl, methylethylbenzyl, methylpropylbenzyl, methylbutylbenzyl, methylpentylbenzyl, methylhexylbenzyl, ethylpropylbenzyl, ethylbutylbenzyl, ethylpentylbenzyl, ethylhexylbenzyl, propylbutylbenzyl, propylpentylbenzyl, propylhexylbenzyl, butylpentylbenzyl, butylhexylbenzyl, trimethylsilylbenzyl, bis(trimethylsilyl)benzyl, trimethylgermylbenzyl, diphenylmethyl and the like; from trihydrocarbyl-silyl, -germyls, -stannyls and -plumbyls including trimethylsilyl, trimethylgermyl, trimethylstannyl, trimethylplumbyl, triethylsilyl, triethylgermyl, dimethylethylsilyl, dimethylethylgermyl, diethylmethylsilyl, diethylmethylgermyl, triphenylsilyl, triphenylgermyl, and all isomers of tripropylsilyl, tripropylgermyl, tributylsilyl, tributylgermyl, tris(trifluormethyl)silyl, bis(perfluoromethyl)methylsilyl, and the like; from all isomers and hydrocarbyl substituted isomers of polycyclic areneyls including pyrenyl, aceanthrylenyl, acenaphthylene, acephenanthrylenyl, azulenyl biphenylenyl, chrysenyl, coronenyl, fluoranthenyl, fluorenyl, heptacenyl, heptalenyl, heptaphenyl, hexacenyl, hexaphenyl, as-indacenyl, s-indecenyl, indenyl, ovalenyl, pentacenyl, pentalenyl, pentaphenyl, perylenyl, phenalenyl, phenanthrenyl, picenyl, pleiadenyl, pyranhrenyl, rubicenyl, naphthacenyl, tetraphenylenyl, trinaphthylenyl, triphenylenyl, hexahelicenyl, naphthyl, anthracenyl, dibenza[a,b]anthracenyl, indanyl, acenaphthenyl, cholanthrenyl, aceanthrenyl, acephenanthrenyl, 1,2,3,4-tetrahydronapthalene, fullerenyl, and the like; from all isomers and hydrocarbyl substituted isomers of alicyclic monocyclic and polycyclic hydrocarbon rings including cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cyclohexenyl, cycloheptyl, cyclooctyl, cyclononyl, cyclodecyl, cycloundecyl, and cyclododecyl, dimethylcyclohexyl, norbornyl, norbornenyl, adamantyl, cubanyl, prismanyl, spiro[4,5]decanyl, and the like; from all isomers and hydrocarbyl substituted isomers of ring assemblies including biphenyl, bicyclopentyl, terphenyl, quatercyclohexanyl, binaphthyl, binorbomyl, phenyl-terphenyl, and the like; from all isomers and hydrocarbyl substituted isomers of bridged monocyclic and polycyclic arenyls including 1,1-diphenylmethano, 1,1-dinapthyletheno, and the like; from all isomers of heterocycles and hydrocarbyl substituted heterocycles including acridarsinyl, acridinyl, acridophosphinyl, 1H-acrindolinyl, anthrazinyl, anthyridinyl, arsanthridinyl, arsindolyl, arsindolizinyl, arsinolinyl, arsinolizinyl, benzofuranyl, carbazolyl, β-carbolinyl, chromenyl, thiochromenyl, cinnolinyl, furanyl, imidazolyl, indazolyl, indolyl, indolizinyl, isoarsindolyl, isoarsinolinyl, isobenzofuranyl, isochromenyl, isothiochromenyl, isoindolyl, isophosphindolyl, isophosphinolinyl, isoquinolinyl, isothiazolyl, isoxazolyl, naphthyridinyl, oxazolyl, perimidinyl, phenanthrazinyl, phenanthridinyl, phenanthrolinyl, phenazinyl, phosphanthridinyl, phosphindolyl, phosphindolizinyl, phosphinolizinyl, phthalazinyl, pteridinyl, phthaloperinyl, purinyl, pyranyl, thiopyranal, pyrazinyl, pyrazolyl, pyridazinyl, pyridinyl, pyrindinyl, pyrimidinyl, pyrrolyl, pyrrolizinyl, quinazolinyl, quindolinyl, 1H-quinindolinyl, quinolinyl, quinolizinyl, quinoxalinyl, selenophenyl, thebenidinyl, thiazolyl, thiophenyl, triphenodioxazinyl, triphenodithiazinyl, xanthenyl, chromanyl, thiochromanyl, imidazolidinyl, indolinyl, isochromanyl, isothiochromanyl, isoindolinyl, morpholinyl, piperazinyl, piperidinyl, pyrozolidinyl, pyrrolidinyl, quinuclidinyl, dimethylacridarsinyl, dimethylacridinyl, dimethylacridophosphinyl, dimethyl-1H-acrindolinyl, dimethylanthrazinyl, dimethylanthyridinyl, dimethylarsanthridinyl, dimethylarsindolyl, dimethylarsindolizinyl, dimethylarsinolinyl, dimethylarsinolizinyl, dibutylbenzofuranyl, dibutylcarbazolyl, dibutyl-β-carbolinyl, dibutylchromenyl, dibutylthiochromenyl, butylcinnolinyl, dibutylfuranyl, dimethylimidazolyl, dimethylindazolyl, dipropylindolyl, dipropylindolizinyl, dimethylisoarsindolyl, methylisoarsinolinyl, dimethylisobenzofuranyl, diphenylisochromenyl, dibutylisothiochromenyl, phenylisoindolyl, butylisophosphindolyl, dibutylisophosphinolinyl, dimethylisoquinolinyl, methylisothiazolyl, butylisoxazolyl, butylnaphthyridinyl, dimethyloxazolyl, methylphenylperimidinyl, tetrabutylphenanthrazinyl, propylphenanthridinyl, dibutylphenanthrolinyl, tetramethylphenazinyl, butylphosphanthridinyl, phenylphosphindolyl, dimethylphosphindolizinyl, methylphosphinolizinyl, dibutylphthalazinyl, trimethylpteridinyl, methylphthaloperinyl, dimethylpurinyl, dibutylpyranyl, dibutylthiopyranal, trimethylpyrazinyl, phenylpyrazolyl, dipropylpyridazinyl, dimethylpyridinyl, methylpropylpyrindinyl, triethylpyrimidinyl, dibutylpyrrolyl, diethylpyrrolizinyl, dibutylquinazolinyl, dibutylquindolinyl, dibutyl-1H-quinindolinyl, dimethylquinolinyl, propylquinolizinyl, methylquinoxalinyl, methylbutylselenophenyl, methylthebenidinyl, dimethylthiazolyl, trimethylthiophenyl, dibutyltriphenodioxazinyl, dibutyltriphenodithiazinyl, dibutylxanthenyl, trimethylchromanyl, dimethylthiochromanyl, dimethylimidazolidinyl, dimethylindolinyl, dibutylisochromanyl, dibutylisothiochromanyl, phenylisoindolinyl, dibutylmorpholinyl, dimethylpiperazinyl, dimethylpiperidinyl, dimethylpyrozolidinyl, dimethylpyrrolidinyl, bipyridyl, pyrido[2,1,6-de]quinolizinyl, hexamethylquinuclidinyl, 5,7-dioxa-6-phosphadibenzo[a,c]cycloheptene-6-oxide, 9-oxa-10-phosphaphenanthrene-10-oxide and the like; from all isomers of polar groups including methoxy, ethoxy, propoxy, butoxy, pentoxy, phenoxy, dimethylphenoxy, dimethylamino, diethylamino, dipropylamino, methylethylamino, methylpropylamino, ethylpropylamino, diphenylamino, methylphenylamino, ethylphenylamino, and the like.

In some embodiments of the invention, it is preferred that at least one R¹¹ and/or at least one R¹² are, independently, methyl, ethyl, n-propyl, iso-propyl, n-butyl, sec-butyl, iso-butyl, tert-butyl, phenyl, napthyl, diphenylmethyl, or trifluoromethyl; more preferably at least one R¹¹ and one R¹² are, independently, methyl, ethyl, n-propyl, iso-propyl, n-butyl, sec-butyl, iso-butyl, tert-butyl, phenyl, napthyl, diphenylmethyl, or trifluoromethyl.

In one preferred embodiment, both R² join together to form a substituted or unsubstituted saturated, partially unsaturated or aromatic cyclic or polycyclic ring structure, with acenaphthylene, [1,4]-dithiane, piperazine, 1,4-dimethylpiperazine, bicyclo[2.2.1]heptane, 1,4-dimethyl[1,4]diazepane, methylcyclopentane, methyltetrahydrofuran, and methyldihydrofuran being the preferred ring structures, and with acenaphthylene being the most preferred ring structure. In another preferred embodiment, each R² is, independently, hydrogen, methyl, ethyl, propyl, or phenyl.

For the production of oligomer, the pre-catalyst structure preferably has both R¹¹ or both R¹² as hydrogen. Preferably both R¹¹ and both R¹² are hydrogen.

For the production of polymer, the pre-catalyst structure preferably has both R¹¹ and both R¹² other than hydrogen, however, one R¹¹ or one R¹² may be hydrogen.

In some embodiments of the invention, the catalyst precursor is represented by the formula L*2-MX, where M is a Group 3-11 transition metal, preferably a Group 8, 9, 10, or 11 transition metal, more preferably, Fe, Co, Ni, or Pd, and even more preferably Fe or Co; X is a substituted or unsubstituted catecholate ligand provided that the substituted catecholate ligand does not contain a 1,2-diketone functionality; and L*2 is a ligand represented by the general formula, L*2,

where N is nitrogen, R¹ is, independently, a bulky hydrocarbyl, substituted bulky hydrocarbyl, bulky halocarbyl, or substituted bulky halocarbyl; and R² is, independently, hydrogen, or a hydrocarbyl, substituted hydrocarbyl, halocarbyl, or substituted halocarbyl provided that a substituted hydrocarbyl is not substituted with trihydrocarbylsiloxy (e.g. —OSiMe₃), and optionally two or more adjacent R² or those separated by one additional atom may join together to form a substituted or unsubstituted, saturated, partially unsaturated or aromatic cyclic or polycyclic ring structure.

Preferred L*2 ligands are those with R², independently, being hydrogen, methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, undecyl, dodecyl, phenyl, and pyridyl. Most preferred are R², independently, being hydrogen, methyl, ethyl, propyl, or phenyl.

Preferred R¹ substituents are, independently, of formulae S1 through S31, with S1, S7 and S16 being most preferred.

In another preferred embodiment catalysts precursors are represented by the formula: TMC Formula 3:

where M is a Group 3-11 transition metal, preferably a Group 8, 9, 10, or 11 transition metal, more preferably, Fe, Co, Ni, or Pd, and even more preferably Fe or Co;

-   N is nitrogen; -   R¹ is, independently, a bulky hydrocarbyl, substituted hydrocarbyl,     halocarbyl, or substituted halocarbyl substituent, and is preferably     described by formulae S1 through S31, and most preferably described     by formulae S1, S7 and S16; -   R² is, independently, hydrogen, or a hydrocarbyl, substituted     hydrocarbyl, halocarbyl, or substituted halocarbyl substituent     provided that a substituted hydrocarbyl is not substituted with     trihydrocarbylsiloxy, and optionally two or more adjacent R² or     those separated by one additional atom may join together to form a     substituted or unsubstituted, saturated, partially unsaturated or     aromatic cyclic or polycyclic ring structure; and -   X is a substituted or unsubstituted catecholate ligand provided that     the substituted catecholate ligand does not contain a 1,2-diketone     functionality.

Preferred R² are, independently, hydrogen, methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, undecyl, dodecyl, phenyl, and pyridyl.

More preferably, the precatalyst of TMC Formula 3 takes is represented by the following structure: TMC Formula 4:

where M is a Group 8, 9, 10, or 11 transition metal, more preferably, Fe, Co, Ni, or Pd, and even more preferably Fe or Co;

-   N is nitrogen; -   O is oxygen; -   R² is, independently, hydrogen, or a hydrocarbyl, substituted     hydrocarbyl, halocarbyl, or substituted halocarbyl substituent     provided that a substituted hydrocarbyl is not substituted with     trihydrocarbylsiloxy, and optionally two or more adjacent R² or     those separated by one additional atom may join together to form a     substituted or unsubstituted, saturated, partially unsaturated or     aromatic cyclic or polycyclic ring structure; -   R¹¹, R¹², and R¹³ are, independently, hydrogen, hydrocarbyl     radicals, substituted hydrocarbyl radicals, halocarbyl radicals,     substituted halocarbyl radicals, silylcarbyl radicals or polar     radicals, and optionally, R¹¹, R¹², and/or two or more R¹³ on     adjacent atoms may join together to form a substituted or     unsubstituted saturated, partially unsaturated or aromatic cyclic or     polycyclic ring structure; and -   R^(a), R^(b), R^(c) and R^(d) are, independently, hydrogen,     hydrocarbyl, substituted hydrocarbyl, halocarbyl or substituted     halocarbyl, and optionally two or more adjacent R^(a), R^(b), R^(c)     and/or R^(d) may join together to form a substituted or     unsubstituted, saturated, partially unsaturated, or aromatic cyclic     or polycyclic substituent.

Some invention embodiments, independently, select R^(a), R^(b), R^(c) and R^(d) from hydrogen, methyl, ethyl, ethenyl, ethynyl and all isomers of propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, nonadecyl, eicosyl, heneicosyl, docosyl, tricosyl, tetracosyl, pentacosyl, hexacosyl, heptacosyl, octacosyl, nonacosyl, triacontyl, propenyl, butenyl, pentenyl, hexenyl, heptenyl, octenyl, nonenyl, decenyl, undecenyl, dodecenyl, tridecenyl, tetradecenyl, pentadecenyl, hexadecenyl, heptadecenyl, octadecenyl, nonadecenyl, eicosenyl, heneicosenyl, docosenyl, tricosenyl, tetracosenyl, pentacosenyl, hexacosenyl, heptacosenyl, octacosenyl, nonacosenyl, triacontenyl, propynyl, butynyl, pentynyl, hexynyl, heptynyl, octynyl, nonynyl, decynyl, undecynyl, dodecynyl, tridecynyl, tetradecynyl, pentadecynyl, hexadecynyl, heptadecynyl, octadecynyl, nonadecynyl, eicosynyl, heneicosynyl, docosynyl, tricosynyl, tetracosynyl, pentacosynyl, hexacosynyl, heptacosynyl, octacosynyl, nonacosynyl, and triacontynyl, phenyl, napthyl, anthracenyl, pyrenyl, biphenyl, benzyl, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, cyclononyl, cyclodecyl, cycloundecyl, cyclododecyl, fluoro, chloro, bromo, iodo, trimethylsilyl, triethylsilyl, tripropylsilyl, dimethylethylsilyl, diethylmethylsilyl, trimethoxysilyl, tirethoxysilyl, tripropoxysilyl, methoxy, ethoxy, propoxy, butoxy, phenoxy, or a nitro, carboxylic acid, ester, ketone (excluding 1,2-diketones) or aldehyde group.

Some invention embodiments prefer that at least one R^(a), R^(b), R^(c) or R^(d) is not hydrogen.

Some invention embodiments select two or more adjacent R^(a), R^(b), R^(c) and/or R^(d) to join together to form a substituted or unsubstituted, saturated, partially unsaturated, or aromatic cyclic or polycyclic substituent. Preferred structures of this type are represented by formulae X1 through X52.

Some invention embodiments, independently, select R¹⁰, R¹¹, R¹², and R¹³ from hydrogen or hydrocarbyl radicals including methyl, ethyl, ethenyl, ethynyl and all isomers of propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, nonadecyl, eicosyl, heneicosyl, docosyl, tricosyl, tetracosyl, pentacosyl, hexacosyl, heptacosyl, octacosyl, nonacosyl, triacontyl, propenyl, butenyl, pentenyl, hexenyl, heptenyl, octenyl, nonenyl, decenyl, undecenyl, dodecenyl, tridecenyl, tetradecenyl, pentadecenyl, hexadecenyl, heptadecenyl, octadecenyl, nonadecenyl, eicosenyl, heneicosenyl, docosenyl, tricosenyl, tetracosenyl, pentacosenyl, hexacosenyl, heptacosenyl, octacosenyl, nonacosenyl, triacontenyl, propynyl, butynyl, pentynyl, hexynyl, heptynyl, octynyl, nonynyl, decynyl, undecynyl, dodecynyl, tridecynyl, tetradecynyl, pentadecynyl, hexadecynyl, heptadecynyl, octadecynyl, nonadecynyl, eicosynyl, heneicosynyl, docosynyl, tricosynyl, tetracosynyl, pentacosynyl, hexacosynyl, heptacosynyl, octacosynyl, nonacosynyl, and triacontynyl; from halocarbyls and all isomers of halocarbyls including perfluoropropyl, perfluorobutyl, perfluoropentyl, perfluorohexyl, perfluoroheptyl, perfluorooctyl, perfluorononyl, perfluorodecyl, perfluoroundecyl, perfluorododecyl, perfluorotridecyl, perfluorotetradecyl, perfluoropentadecyl, perfluorohexadecyl, perfluoroheptadecyl, perfluorooctadecyl, perfluorononadecyl, perfluoroeicosyl, perfluoroheneicosyl, perfluorodocosyl, perfluorotricosyl, perfluorotetracosyl, perfluoropentacosyl, perfluorohexacosyl, perfluoroheptacosyl, perfluorooctacosyl, perfluorononacosyl, perfluorotriacontyl, perfluorobutenyl, perfluorobutynyl, fluoropropyl, fluorobutyl, fluoropentyl, fluorohexyl, fluoroheptyl, fluorooctyl, fluorononyl, fluorodecyl, fluoroundecyl, fluorododecyl, fluorotridecyl, fluorotetradecyl, fluoropentadecyl, fluorohexadecyl, fluoroheptadecyl, fluorooctadecyl, fluorononadecyl, fluoroeicosyl, fluoroheneicosyl, fluorodocosyl, fluorotricosyl, fluorotetracosyl, fluoropentacosyl, fluorohexacosyl, fluoroheptacosyl, fluorooctacosyl, fluorononacosyl, fluorotriacontyl, difluorobutyl, trifluorobutyl, tetrafluorobutyl, pentafluorobutyl, hexafluorobutyl, heptafluorobutyl, octafluorobutyl; from substituted hydrocarbyl radicals and all isomers of substituted hydrocarbyl radicals including methoxypropyl, methoxybutyl, methoxypentyl, methoxyhexyl, methoxyheptyl, methoxyoctyl, methoxynonyl, methoxydecyl, methoxyundecyl, methoxydodecyl, methoxytridecyl, methoxytetradecyl, methoxypentadecyl, methoxyhexadecyl, methoxyheptadecyl, methoxyoctadecyl, methoxynonadecyl, methoxyeicosyl, methoxyheneicosyl, methoxydocosyl, methoxytricosyl, methoxytetracosyl, methoxypentacosyl, methoxyhexacosyl, methoxyheptacosyl, methoxyoctacosyl, methoxynonacosyl, methoxytriacontyl, butoxypropyl, butoxybutyl, butoxypentyl, butoxyhexyl, butoxyheptyl, butoxyoctyl, butoxynonyl, butoxydecyl, butoxyundecyl, butoxydodecyl, butoxytridecyl, butoxytetradecyl, butoxypentadecyl, butoxyhexadecyl, butoxyheptadecyl, butoxyoctadecyl, butoxynonadecyl, butoxyeicosyl, butoxyheneicosyl, butoxydocosyl, butoxytricosyl, butoxytetracosyl, butoxypentacosyl, butoxyhexacosyl, butoxyheptacosyl, butoxyoctacosyl, butoxynonacosyl, butoxytriacontyl, dimethylaminopropyl, dimethylaminobutyl, dimethylaminopentyl, dimethylaminohexyl, dimethylaminoheptyl, dimethylaminooctyl, dimethylaminononyl, dimethylaminodecyl, dimethylaminoundecyl, dimethylaminododecyl, dimethylaminotridecyl, dimethylaminotetradecyl, dimethylaminopentadecyl, dimethylaminohexadecyl, dimethylaminoheptadecyl, dimethylaminooctadecyl, dimethylaminononadecyl, dimethylaminoeicosyl, dimethylaminoheneicosyl, dimethylaminodocosyl, dimethylaminotricosyl, dimethylaminotetracosyl, dimethylaminopentacosyl, dimethylaminohexacosyl, dimethylaminoheptacosyl, dimethylaminooctacosyl, dimethylaminononacosyl, dimethylaminotriacontyl, trimethylsilyipropyl, trimethylsilylbutyl, trimethylsilylpentyl, trimethylsilylhexyl, trimethylsilylheptyl, trimethylsilyloctyl, trimethylsilylnonyl, trimethylsilyldecyl, trimethylsilylundecyl, trimethylsilyldodecyl, trimethylsilyltridecyl, trimethylsilyltetradecyl, trimethylsilylpentadecyl, trimethylsilylhexadecyl, trimethylsilylheptadecyl, trimethylsilyloctadecyl, trimethylsilylnonadecyl, trimethylsilyleicosyl, trimethylsilylheneicosyl, trimethylsilyldocosyl, trimethylsilyltricosyl, trimethylsilyltetracosyl, trimethylsilylpentacosyl, trimethylsilylhexacosyl, trimethylsilylheptacosyl, trimethylsilyloctacosyl, trimethylsilylnonacosyl, trimethylsilyltriacontyl and the like; from phenyl, and all isomers of hydrocarbyl substituted phenyl including methylphenyl, dimethylphenyl, trimethylphenyl, tetramethylphenyl, pentamethylphenyl ethylphenyl, diethylphenyl, triethylphenyl, tetraethylphenyl, pentaethylphenyl, propylphenyl, dipropylphenyl, tripropylphenyl, tetrapropylphenyl, pentapropylphenyl butylphenyl, dibutylphenyl, tributylphenyl, tetrabutylphenyl, pentabutylphenyl, hexylphenyl, dihexylphenyl, trihexylphenyl, tetrahexylphenyl, pentahexylphenyl, dimethylethylphenyl, dimethylpropylphenyl, dimethylbutylphenyl, dimethylpentylphenyl, dimethylhexylphenyl, diethylmethylphenyl, diethylpropylphenyl, diethylbutylphenyl, diethylpentylphenyl, diethylhexylphenyl, dipropylmethylphenyl, dipropylethylphenyl, dipropylbutylphenyl, dipropylpentylphenyl, dipropylhexylphenyl, dibutylmethylphenyl, dibutylethylphenyl, dibutylpropylphenyl, dibutylpentylphenyl, dibutylhexylphenyl, methylethylphenyl, methylpropylphenyl, methylbutylphenyl, methylpentylphenyl, methylhexylphenyl, ethylpropylphenyl, ethylbutylphenyl, ethylpentylphenyl, ethylhexylphenyl, propylbutylphenyl, propylpentylphenyl, propylhexylphenyl, butylpentylphenyl, butylhexylphenyl, trimethylsilylphenyl, trimethylgermylphenyl, trifluoromethylphenyl, bis(triflouromethyl)phenyl and the like; from all isomers of halo substituted phenyl (where halo is, independently, fluoro, chloro, bromo and iodo) including halophenyl, dihalophenyl, trihalophenyl, tetrahalophenyl, and pentahalophenyl; from all isomers of halo substituted hydrocarbyl substituted phenyl (where halo is, independently, fluoro, chloro, bromo and iodo) including halomethylphenyl, dihalomethylphenyl, trihalomethylphenyl, tetrahalomethylphenyl, haloethlyphenyl, dihaloethylphenyl, trihaloethylphenyl, tetrahaloethylphenyl, halopropylphenyl, dihalopropylphenyl, trihalopropylphenyl, tetrahalopropylphenyl, halobutylphenyl, dihalobutylphenyl, trihalobutylphenyl, tetrahalobutylphenyl, dihalodimethylphenyl, dihalo(trifluoromethyl)phenyl and the like; from all isomers of benzyl, and all isomers of hydrocarbyl substituted benzyl including methylbenzyl, dimethylbenzyl, trimethylbenzyl, tetramethylbenzyl, pentamethylbenzyl ethylbenzyl, diethylbenzyl, triethylbenzyl, tetraethylbenzyl, pentaethylbenzyl, propylbenzyl, dipropylbenzyl, tripropylbenzyl, tetrapropylbenzyl, pentapropylbenzyl butylbenzyl, dibutylbenzyl, tributylbenzyl, tetrabutylbenzyl, pentabutylbenzyl, hexylbenzyl, dihexylbenzyl, trihexylbenzyl, tetrahexylbenzyl, pentahexylbenzyl, dimethylethylbenzyl, dimethylpropylbenzyl, dimethylbutylbenzyl, dimethylpentylbenzyl, dimethylhexylbenzyl, diethylmethylbenzyl, diethylpropylbenzyl, diethylbutylbenzyl, diethylpentylbenzyl, diethylhexylbenzyl, dipropylmethylbenzyl, dipropylethylbenzyl, dipropylbutylbenzyl, dipropylpentylbenzyl, dipropylhexylbenzyl, dibutylmethylbenzyl, dibutylethylbenzyl, dibutylpropylbenzyl, dibutylpentylbenzyl, dibutylhexylbenzyl, methylethylbenzyl, methylpropylbenzyl, methylbutylbenzyl, methylpentylbenzyl, methylhexylbenzyl, ethylpropylbenzyl, ethylbutylbenzyl, ethylpentylbenzyl, ethylhexylbenzyl, propylbutylbenzyl, propylpentylbenzyl, propylhexylbenzyl, butylpentylbenzyl, butylhexylbenzyl, trimethylsilylbenzyl, bis(trimethylsilyl)benzyl, trimethylgermylbenzyl, diphenylmethyl and the like; from trihydrocarbyl-silyl, -germyls, -stannyls and -plumbyls including trimethylsilyl, trimethylgermyl, trimethylstannyl, trimethylplumbyl, triethylsilyl, triethylgermyl, dimethylethylsilyl, dimethylethylgermyl, diethylmethylsilyl, diethylmethylgermyl, triphenylsilyl, triphenylgermyl, and all isomers of tripropylsilyl, tripropylgermyl, tributylsilyl, tributylgermyl, tris(trifluormethyl)silyl, bis(perfluoromethyl)methylsilyl, and the like; from all isomers and hydrocarbyl substituted isomers of polycyclic areneyls including pyrenyl, aceanthrylenyl, acenaphthylene, acephenanthrylenyl, azulenyl biphenylenyl, chrysenyl, coronenyl, fluoranthenyl, fluorenyl, heptacenyl, heptalenyl, heptaphenyl, hexacenyl, hexaphenyl, as-indacenyl, s-indecenyl, indenyl, ovalenyl, pentacenyl, pentalenyl, pentaphenyl, perylenyl, phenalenyl, phenanthrenyl, picenyl, pleiadenyl, pyranhrenyl, rubicenyl, naphthacenyl, tetraphenylenyl, trinaphthylenyl, triphenylenyl, hexahelicenyl, naphthyl, anthracenyl, dibenza[a,b]anthracenyl, indanyl, acenaphthenyl, cholanthrenyl, aceanthrenyl, acephenanthrenyl, 1,2,3,4-tetrahydronapthalene, fullerenyl, and the like; from all isomers and hydrocarbyl substituted isomers of alicyclic monocyclic and polycyclic hydrocarbon rings including cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cyclohexenyl, cycloheptyl, cyclooctyl, cyclononyl, cyclodecyl, cycloundecyl, and cyclododecyl, dimethylcyclohexyl, norbomyl, norbornenyl, adamantyl, cubanyl, prismanyl, spiro[4,5]decanyl, and the like; from all isomers and hydrocarbyl substituted isomers of ring assemblies including biphenyl, bicyclopentyl, terphenyl, quatercyclohexanyl, binaphthyl, binorbomyl, phenyl-terphenyl, and the like; from all isomers and hydrocarbyl substituted isomers of bridged monocyclic and polycyclic arenyls including 1,1-diphenylmethano, 1,1-dinapthyletheno, and the like; from all isomers of heterocycles and hydrocarbyl substituted heterocycles including acridarsinyl, acridinyl, acridophosphinyl, 1H-acrindolinyl, anthrazinyl, anthyridinyl, arsanthridinyl, arsindolyl, arsindolizinyl, arsinolinyl, arsinolizinyl, benzofuranyl, carbazolyl, β-carbolinyl, chromenyl, thiochromenyl, cinnolinyl, furanyl, imidazolyl, indazolyl, indolyl, indolizinyl, isoarsindolyl, isoarsinolinyl, isobenzofuranyl, isochromenyl, isothiochromenyl, isoindolyl, isophosphindolyl, isophosphinolinyl, isoquinolinyl, isothiazolyl, isoxazolyl, naphthyridinyl, oxazolyl, perimidinyl, phenanthrazinyl, phenanthridinyl, phenanthrolinyl, phenazinyl, phosphanthridinyl, phosphindolyl, phosphindolizinyl, phosphinolizinyl, phthalazinyl, pteridinyl, phthaloperinyl, purinyl, pyranyl, thiopyranal, pyrazinyl, pyrazolyl, pyridazinyl, pyridinyl, pyrindinyl, pyrimidinyl, pyrrolyl, pyrrolizinyl, quinazolinyl, quindolinyl, 1H-quinindolinyl, quinolinyl, quinolizinyl, quinoxalinyl, selenophenyl, thebenidinyl, thiazolyl, thiophenyl, triphenodioxazinyl, triphenodithiazinyl, xanthenyl, chromanyl, thiochromanyl, imidazolidinyl, indolinyl, isochromanyl, isothiochromanyl, isoindolinyl, morpholinyl, piperazinyl, piperidinyl, pyrozolidinyl, pyrrolidinyl, quinuclidinyl, dimethylacridarsinyl, dimethylacridinyl, dimethylacridophosphinyl, dimethyl-1H-acrindolinyl, dimethylanthrazinyl, dimethylanthyridinyl, dimethylarsanthridinyl, dimethylarsindolyl, dimethylarsindolizinyl, dimethylarsinolinyl, dimethylarsinolizinyl, dibutylbenzofuranyl, dibutylcarbazolyl, dibutyl-β-carbolinyl, dibutylchromenyl, dibutylthiochromenyl, butylcinnolinyl, dibutylfuranyl, dimethylimidazolyl, dimethylindazolyl, dipropylindolyl, dipropylindolizinyl, dimethylisoarsindolyl, methylisoarsinolinyl, dimethylisobenzofuranyl, diphenylisochromenyl, dibutylisothiochromenyl, phenylisoindolyl, butylisophosphindolyl, dibutylisophosphinolinyl, dimethylisoquinolinyl, methylisothiazolyl, butylisoxazolyl, butylnaphthyridinyl, dimethyloxazolyl, methylphenylperimidinyl, tetrabutylphenanthrazinyl, propylphenanthridinyl, dibutylphenanthrolinyl, tetramethylphenazinyl, butylphosphanthridinyl, phenylphosphindolyl, dimethylphosphindolizinyl, methylphosphinolizinyl, dibutylphthalazinyl, trimethylpteridinyl, methylphthaloperinyl, dimethylpurinyl, dibutylpyranyl, dibutylthiopyranal, trimethylpyrazinyl, phenylpyrazolyl, dipropylpyridazinyl, dimethylpyridinyl, methylpropylpyrindinyl, triethylpyrimidinyl, dibutylpyrrolyl, diethylpyrrolizinyl, dibutylquinazolinyl, dibutylquindolinyl, dibutyl-1H-quinindolinyl, dimethylquinolinyl, propylquinolizinyl, methylquinoxalinyl, methylbutylselenophenyl, methylthebenidinyl, dimethylthiazolyl, trimethylthiophenyl, dibutyltriphenodioxazinyl, dibutyltriphenodithiazinyl, dibutylxanthenyl, trimethylchromanyl, dimethylthiochromanyl, dimethylimidazolidinyl, dimethylindolinyl, dibutylisochromanyl, dibutylisothiochromanyl, phenylisoindolinyl, dibutylmorpholinyl, dimethylpiperazinyl, dimethylpiperidinyl, dimethylpyrozolidinyl, dimethylpyrrolidinyl, bipyridyl, pyrido[2,1,6-de]quinolizinyl, hexamethylquinuclidinyl, 5,7-dioxa-6-phosphadibenzo[a,c]cycloheptene-6-oxide, 9-oxa-10-phosphaphenanthrene-10-oxide and the like; from all isomers of polar groups including methoxy, ethoxy, propoxy, butoxy, pentoxy, phenoxy, dimethylphenoxy, dimethylamino, diethylamino, dipropylamino, methylethylarnino, methylpropylamino, ethylpropylamino, diphenylamino, methylphenylamino, ethylphenylamino, and the like.

In some embodiments of the invention, it is preferred that at least one R¹¹ and/or at least one R¹² are, independently, methyl, ethyl, n-propyl, iso-propyl, n-butyl, sec-butyl, iso-butyl, tert-butyl, phenyl, napthyl, diphenylmethyl, or trifluoromethyl; more preferably at least one R¹¹ and one R¹² are, independently, methyl, ethyl, n-propyl, iso-propyl, n-butyl, sec-butyl, iso-butyl, tert-butyl, phenyl, napthyl, diphenylmethyl, or trifluoromethyl.

For the production of oligomer, the pre-catalyst structure preferably has both R¹¹ or both R¹² as hydrogen. Alternatively both R¹¹ and both R¹² are hydrogen. Alternatively, R¹¹ and R¹² on the same aryl ring are hydrogen and on the other aryl ring are not hydrogen.

For the production of polymer, the pre-catalyst structure preferably has both R¹¹ and both R¹² other than hydrogen, however, one R¹¹ or one R¹² may be hydrogen.

In some embodiments of the invention, the catalyst precursor is represented by the formula L*13-MX, where M is a Group 3-11 transition metal, preferably a Group 8, 9, 10, or 11 transition metal, more preferably, Fe, Co, Ni, or Pd, and even more preferably Ni or Pd; X is a substituted or unsubstituted catecholate ligand provided that the substituted catecholate ligand does not contain a 1,2-diketone functionality; and L*3 is ligand represented by the general formula, L*13,

where N is nitrogen, R¹ is, independently, a bulky hydrocarbyl, substituted bulky hydrocarbyl, bulky halocarbyl, or substituted bulky halocarbyl; R² is, independently, hydrogen, or a hydrocarbyl, substituted hydrocarbyl, halocarbyl, or substituted halocarbyl provided that a substituted hydrocarbyl is not substituted with trihydrocarbylsiloxy (e.g. —SiMe₃), and R⁴ is hydrogen, hydrocarbyl, substituted hydrocarbyl, halocarbyl, or substituted halocarbyl, but is preferably a bulky hydrocarbyl, substituted bulky hydrocarbyl, bulky halocarbyl, or substituted bulky halocarbyl as defined for R¹, and where and optionally two or more adjacent R² and/or R⁴, or those separated by one additional atom may join together to form a substituted or unsubstituted, saturated, partially unsaturated or aromatic cyclic or polycyclic ring structure.

Preferred L*13 ligands are those with R², independently, being hydrogen, methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, undecyl, dodecyl, phenyl, and pyridyl. Most preferred are R², independently, being hydrogen, methyl, ethyl, propyl, or phenyl.

Preferred R¹ substituents are, independently, of formulae S1 through S31, with S1, S7 and S16 being most preferred.

Still in other embodiments, the catalyst precursor is represented by the formula: TMC Formula 5:

where M is a Group 3-11 transition metal, preferably a Group 8, 9, 10, or 11 transition metal, more preferably, Fe, Co, Ni, or Pd, and even more preferably Ni or Pd;

N is nitrogen;

R¹ is, independently, a bulky hydrocarbyl, substituted hydrocarbyl, halocarbyl, or substituted halocarbyl substituent, and is preferably described by formulae S1 through S31, and most preferably described by formulae S1, S7 and S16;

R² is, independently, hydrogen, or a hydrocarbyl, substituted hydrocarbyl, halocarbyl, or substituted halocarbyl substituent provided that a substituted hydrocarbyl is not substituted with trihydrocarbylsiloxy; R⁴ is hydrogen, hydrocarbyl, substituted hydrocarbyl, halocarbyl, or substituted halocarbyl, but is preferably a bulky hydrocarbyl, substituted bulky hydrocarbyl, bulky halocarbyl, or substituted bulky halocarbyl as defined for R¹; and where optionally two or more adjacent R² and/or R⁴, or those separated by one additional atom may join together to form a substituted or unsubstituted, saturated, partially unsaturated or aromatic cyclic or polycyclic ring structure; and

X is a substituted or unsubstituted catecholate ligand provided that the substituted catecholate ligand does not contain a 1,2-diketone functionality.

Preferred R² are, independently, hydrogen, methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, undecyl, dodecyl, phenyl, and pyridyl.

Preferred precatalysts also include those represented by the following structure: TMC Formula 6:

where M is a Group 8, 9, 10, or 11 transition metal, more preferably, Fe, Co, Ni, or Pd, and even more preferably Ni or Pd;

N is nitrogen;

O is oxygen;

R² is, independently, hydrogen, or a hydrocarbyl, substituted hydrocarbyl, halocarbyl, or substituted halocarbyl substituent provided that a substituted hydrocarbyl is not substituted with trihydrocarbylsiloxy; R⁴ is hydrogen, hydrocarbyl, substituted hydrocarbyl, halocarbyl, or substituted halocarbyl, but is preferably a bulky hydrocarbyl, substituted bulky hydrocarbyl, bulky halocarbyl, or substituted bulky halocarbyl as defined for R¹; and where optionally two or more adjacent R² and/or R⁴, or those separated by one additional atom may join together to form a substituted or unsubstituted, saturated, partially unsaturated or aromatic cyclic or polycyclic ring structure;

R¹¹, R¹², and R¹³ are, independently, hydrogen, hydrocarbyl radicals, substituted hydrocarbyl radicals, halocarbyl radicals, substituted halocarbyl radicals, silylcarbyl radicals or polar radicals, and optionally, R¹¹, R¹², and/or two or more R¹³ on adjacent atoms may join together to form a substituted or unsubstituted saturated, partially unsaturated or aromatic cyclic or polycyclic ring structure; and

R^(a), R^(b), R^(c) and R^(d) are, independently, hydrogen, hydrocarbyl, substituted hydrocarbyl, halocarbyl or substituted halocarbyl, and optionally two or more adjacent R^(a), R^(b), R^(c) and/or R^(d) may join together to form a substituted or unsubstituted, saturated, partially unsaturated, or aromatic cyclic or polycyclic substituent.

Some invention embodiments, independently, select R^(a), R^(b), R^(c) and R^(d) from hydrogen, methyl, ethyl, ethenyl, ethynyl and all isomers of propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, nonadecyl, eicosyl, heneicosyl, docosyl, tricosyl, tetracosyl, pentacosyl, hexacosyl, heptacosyl, octacosyl, nonacosyl, triacontyl, propenyl, butenyl, pentenyl, hexenyl, heptenyl, octenyl, nonenyl, decenyl, undecenyl, dodecenyl, tridecenyl, tetradecenyl, pentadecenyl, hexadecenyl, heptadecenyl, octadecenyl, nonadecenyl, eicosenyl, heneicosenyl, docosenyl, tricosenyl, tetracosenyl, pentacosenyl, hexacosenyl, heptacosenyl, octacosenyl, nonacosenyl, triacontenyl, propynyl, butynyl, pentynyl, hexynyl, heptynyl, octynyl, nonynyl, decynyl, undecynyl, dodecynyl, tridecynyl, tetradecynyl, pentadecynyl, hexadecynyl, heptadecynyl, octadecynyl, nonadecynyl, eicosynyl, heneicosynyl, docosynyl, tricosynyl, tetracosynyl, pentacosynyl, hexacosynyl, heptacosynyl, octacosynyl, nonacosynyl, and triacontynyl, phenyl, napthyl, anthracenyl, pyrenyl, biphenyl, benzyl, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, cyclononyl, cyclodecyl, cycloundecyl, cyclododecyl, fluoro, chloro, bromo, iodo, trimethylsilyl, triethylsilyl, tripropylsilyl, dimethylethylsilyl, diethylmethylsilyl, trimethoxysilyl, tirethoxysilyl, tripropoxysilyl, methoxy, ethoxy, propoxy, butoxy, phenoxy, or a nitro, carboxylic acid, ester, ketone (excluding 1,2-diketones) or aldehyde group.

Some invention embodiments prefer that at least one R^(a), R^(b), R^(c) or R^(d) is not hydrogen.

Some invention embodiments select two or more adjacent R^(a), R^(b), R^(c) and/or R^(d) to join together to form a substituted or unsubstituted, saturated, partially unsaturated, or aromatic cyclic or polycyclic substituent. Preferred structures of this type are represented by formulae X1 through X52.

Some invention embodiments select R¹⁰, R¹¹, R¹², and R¹³ from hydrogen or hydrocarbyl radicals including methyl, ethyl, ethenyl, ethynyl and all isomers of propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, nonadecyl, eicosyl, heneicosyl, docosyl, tricosyl, tetracosyl, pentacosyl, hexacosyl, heptacosyl, octacosyl, nonacosyl, triacontyl, propenyl, butenyl, pentenyl, hexenyl, heptenyl, octenyl, nonenyl, decenyl, undecenyl, dodecenyl, tridecenyl, tetradecenyl, pentadecenyl, hexadecenyl, heptadecenyl, octadecenyl, nonadecenyl, eicosenyl, heneicosenyl, docosenyl, tricosenyl, tetracosenyl, pentacosenyl, hexacosenyl, heptacosenyl, octacosenyl, nonacosenyl, triacontenyl, propynyl, butynyl, pentynyl, hexynyl, heptynyl, octynyl, nonynyl, decynyl, undecynyl, dodecynyl, tridecynyl, tetradecynyl, pentadecynyl, hexadecynyl, heptadecynyl, octadecynyl, nonadecynyl, eicosynyl, heneicosynyl, docosynyl, tricosynyl, tetracosynyl, pentacosynyl, hexacosynyl, heptacosynyl, octacosynyl, nonacosynyl, and triacontynyl; from halocarbyls and all isomers of halocarbyls including perfluoropropyl, perfluorobutyl, perfluoropentyl, perfluorohexyl, perfluoroheptyl, perfluorooctyl, perfluorononyl, perfluorodecyl, perfluoroundecyl, perfluorododecyl, perfluorotridecyl, perfluorotetradecyl, perfluoropentadecyl, perfluorohexadecyl, perfluoroheptadecyl, perfluorooctadecyl, perfluorononadecyl, perfluoroeicosyl, perfluoroheneicosyl, perfluorodocosyl, perfluorotricosyl, perfluorotetracosyl, perfluoropentacosyl, perfluorohexacosyl, perfluoroheptacosyl, perfluorooctacosyl, perfluorononacosyl, perfluorotriacontyl, perfluorobutenyl, perfluorobutynyl, fluoropropyl, fluorobutyl, fluoropentyl, fluorohexyl, fluoroheptyl, fluorooctyl, fluorononyl, fluorodecyl, fluoroundecyl, fluorododecyl, fluorotridecyl, fluorotetradecyl, fluoropentadecyl, fluorohexadecyl, fluoroheptadecyl, fluorooctadecyl, fluorononadecyl, fluoroeicosyl, fluoroheneicosyl, fluorodocosyl, fluorotricosyl, fluorotetracosyl, fluoropentacosyl, fluorohexacosyl, fluoroheptacosyl, fluorooctacosyl, fluorononacosyl, fluorotriacontyl, difluorobutyl, trifluorobutyl, tetrafluorobutyl, pentafluorobutyl, hexafluorobutyl, heptafluorobutyl, octafluorobutyl; from substituted hydrocarbyl radicals and all isomers of substituted hydrocarbyl radicals including methoxypropyl, methoxybutyl, methoxypentyl, methoxyhexyl, methoxyheptyl, methoxyoctyl, methoxynonyl, methoxydecyl, methoxyundecyl, methoxydodecyl, methoxytridecyl, methoxytetradecyl, methoxypentadecyl, methoxyhexadecyl, methoxyheptadecyl, methoxyoctadecyl, methoxynonadecyl, methoxyeicosyl, methoxyheneicosyl, methoxydocosyl, methoxytricosyl, methoxytetracosyl, methoxypentacosyl, methoxyhexacosyl, methoxyheptacosyl, methoxyoctacosyl, methoxynonacosyl, methoxytriacontyl, butoxypropyl, butoxybutyl, butoxypentyl, butoxyhexyl, butoxyheptyl, butoxyoctyl, butoxynonyl, butoxydecyl, butoxyundecyl, butoxydodecyl, butoxytridecyl, butoxytetradecyl, butoxypentadecyl, butoxyhexadecyl, butoxyheptadecyl, butoxyoctadecyl, butoxynonadecyl, butoxyeicosyl, butoxyheneicosyl, butoxydocosyl, butoxytricosyl, butoxytetracosyl, butoxypentacosyl, butoxyhexacosyl, butoxyheptacosyl, butoxyoctacosyl, butoxynonacosyl, butoxytriacontyl, dimethylaminopropyl, dimethylaminobutyl, dimethylaminopentyl, dimethylaminohexyl, dimethylaminoheptyl, dimethylaminooctyl, dimethylaminononyl, dimethylaminodecyl, dimethylaminoundecyl, dimethylaminododecyl, dimethylaminotridecyl, dimethylaminotetradecyl, dimethylaminopentadecyl, dimethylaminohexadecyl, dimethylaminoheptadecyl, dimethylaminooctadecyl, dimethylaminononadecyl, dimethylaminoeicosyl, dimethylaminoheneicosyl, dimethylaminodocosyl, dimethylaminotricosyl, dimethylaminotetracosyl, dimethylaminopentacosyl, dimethylaminohexacosyl, dimethylaminoheptacosyl, dimethylaminooctacosyl, dimethylaminononacosyl, dimethylaminotriacontyl, trimethylsilylpropyl, trimethylsilylbutyl, trimethylsilylpentyl, trimethylsilylhexyl, trimethylsilylheptyl, trimethylsilyloctyl, trimethylsilylnonyl, trimethylsilyldecyl, trimethylsilylundecyl, trimethylsilyldodecyl, trimethylsilyltridecyl, trimethylsilyltetradecyl, trimethylsilylpentadecyl, trimethylsilylhexadecyl, trimethylsilylheptadecyl, trimethylsilyloctadecyl, trimethylsilylnonadecyl, trimethylsilyleicosyl, trimethylsilylheneicosyl, trimethylsilyldocosyl, trimethylsilyltricosyl, trimethylsilyltetracosyl, trimethylsilylpentacosyl, trimethylsilylhexacosyl, trimethylsilylheptacosyl, trimethylsilyloctacosyl, trimethylsilylnonacosyl, trimethylsilyltriacontyl and the like; from phenyl, and all isomers of hydrocarbyl substituted phenyl including methylphenyl, dimethylphenyl, trimethylphenyl, tetramethylphenyl, pentamethylphenyl ethylphenyl, diethylphenyl, triethylphenyl, tetraethylphenyl, pentaethylphenyl, propylphenyl, dipropylphenyl, tripropylphenyl, tetrapropylphenyl, pentapropylphenyl butylphenyl, dibutylphenyl, tributylphenyl, tetrabutylphenyl, pentabutylphenyl, hexylphenyl, dihexylphenyl, trihexylphenyl, tetrahexylphenyl, pentahexylphenyl, dimethylethylphenyl, dimethylpropylphenyl, dimethylbutylphenyl, dimethylpentylphenyl, dimethylhexylphenyl, diethylmethylphenyl, diethylpropylphenyl, diethylbutylphenyl, diethylpentylphenyl, diethylhexylphenyl, dipropylmethylphenyl, dipropylethylphenyl, dipropylbutylphenyl, dipropylpentylphenyl, dipropylhexylphenyl, dibutylmethylphenyl, dibutylethylphenyl, dibutylpropylphenyl, dibutylpentylphenyl, dibutylhexylphenyl, methylethylphenyl, methylpropylphenyl, methylbutylphenyl, methylpentylphenyl, methylhexylphenyl, ethylpropylphenyl, ethylbutylphenyl, ethylpentylphenyl, ethylhexylphenyl, propylbutylphenyl, propylpentylphenyl, propylhexylphenyl, butylpentylphenyl, butylhexylphenyl, trimethylsilylphenyl, trimethylgermylphenyl, trifluoromethylphenyl, bis(triflouromethyl)phenyl and the like; from all isomers of halo substituted phenyl (where halo is, independently, fluoro, chloro, bromo and iodo) including halophenyl, dihalophenyl, trihalophenyl, tetrahalophenyl, and pentahalophenyl; from all isomers of halo substituted hydrocarbyl substituted phenyl (where halo is, independently, fluoro, chloro, bromo and iodo) including halomethylphenyl, dihalomethylphenyl, trihalomethylphenyl, tetrahalomethylphenyl, haloethlyphenyl, dihaloethylphenyl, trihaloethylphenyl, tetrahaloethylphenyl, halopropylphenyl, dihalopropylphenyl, trihalopropylphenyl, tetrahalopropylphenyl, halobutylphenyl, dihalobutylphenyl, trihalobutylphenyl, tetrahalobutylphenyl, dihalodimethylphenyl, dihalo(trifluoromethyl)phenyl and the like; from all isomers of benzyl, and all isomers of hydrocarbyl substituted benzyl including methylbenzyl, dimethylbenzyl, trimethylbenzyl, tetramethylbenzyl, pentamethylbenzyl ethylbenzyl, diethylbenzyl, triethylbenzyl, tetraethylbenzyl, pentaethylbenzyl, propylbenzyl, dipropylbenzyl, tripropylbenzyl, tetrapropylbenzyl, pentapropylbenzyl butylbenzyl, dibutylbenzyl, tributylbenzyl, tetrabutylbenzyl, pentabutylbenzyl, hexylbenzyl, dihexylbenzyl, trihexylbenzyl, tetrahexylbenzyl, pentahexylbenzyl, dimethylethylbenzyl, dimethylpropylbenzyl, dimethylbutylbenzyl, dimethylpentylbenzyl, dimethylhexylbenzyl, diethylmethylbenzyl, diethylpropylbenzyl, diethylbutylbenzyl, diethylpentylbenzyl, diethylhexylbenzyl, dipropylmethylbenzyl, dipropylethylbenzyl, dipropylbutylbenzyl, dipropylpentylbenzyl, dipropylhexylbenzyl, dibutylmethylbenzyl, dibutylethylbenzyl, dibutylpropylbenzyl, dibutylpentylbenzyl, dibutylhexylbenzyl, methylethylbenzyl, methylpropylbenzyl, methylbutylbenzyl, methylpentylbenzyl, methylhexylbenzyl, ethylpropylbenzyl, ethylbutylbenzyl, ethylpentylbenzyl, ethylhexylbenzyl, propylbutylbenzyl, propylpentylbenzyl, propylhexylbenzyl, butylpentylbenzyl, butylhexylbenzyl, trimethylsilylbenzyl, bis(trimethylsilyl)benzyl, trimethylgermylbenzyl, diphenylmethyl and the like; from trihydrocarbyl-silyl, -germyls, -stannyls and -plumbyls including trimethylsilyl, trimethylgermyl, trimethylstannyl, trimethylplumbyl, triethylsilyl, triethylgermyl, dimethylethylsilyl, dimethylethylgermyl, diethylmethylsilyl, diethylmethylgermyl, triphenylsilyl, triphenylgermyl, and all isomers of tripropylsilyl, tripropylgermyl, tributylsilyl, tributylgermyl, tris(trifluormethyl)silyl, bis(perfluoromethyl)methylsilyl, and the like; from all isomers and hydrocarbyl substituted isomers of polycyclic areneyls including pyrenyl, aceanthrylenyl, acenaphthylene, acephenanthrylenyl, azulenyl biphenylenyl, chrysenyl, coronenyl, fluoranthenyl, fluorenyl, heptacenyl, heptalenyl, heptaphenyl, hexacenyl, hexaphenyl, as-indacenyl, s-indecenyl, indenyl, ovalenyl, pentacenyl, pentalenyl, pentaphenyl, perylenyl, phenalenyl, phenanthrenyl, picenyl, pleiadenyl, pyranhrenyl, rubicenyl, naphthacenyl, tetraphenylenyl, trinaphthylenyl, triphenylenyl, hexahelicenyl, naphthyl, anthracenyl, dibenza[a,b]anthracenyl, indanyl, acenaphthenyl, cholanthrenyl, aceanthrenyl, acephenanthrenyl, 1,2,3,4-tetrahydronapthalene, fullerenyl, and the like; from all isomers and hydrocarbyl substituted isomers of alicyclic monocyclic and polycyclic hydrocarbon rings including cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cyclohexenyl, cycloheptyl, cyclooctyl, cyclononyl, cyclodecyl, cycloundecyl, and cyclododecyl, dimethylcyclohexyl, norbornyl, norbornenyl, adamantyl, cubanyl, prismanyl, spiro[4,5]decanyl, and the like; from all isomers and hydrocarbyl substituted isomers of ring assemblies including biphenyl, bicyclopentyl, terphenyl, quatercyclohexanyl, binaphthyl, binorbornyl, phenyl-terphenyl, and the like; from all isomers and hydrocarbyl substituted isomers of bridged monocyclic and polycyclic arenyls including 1,1-diphenylmethano, 1,1-dinapthyletheno, and the like; from all isomers of heterocycles and hydrocarbyl substituted heterocycles including acridarsinyl, acridinyl, acridophosphinyl, 1H-acrindolinyl, anthrazinyl, anthyridinyl, arsanthridinyl, arsindolyl, arsindolizinyl, arsinolinyl, arsinolizinyl, benzofuranyl, carbazolyl, β-carbolinyl, chromenyl, thiochromenyl, cinnolinyl, furanyl, imidazolyl, indazolyl, indolyl, indolizinyl, isoarsindolyl, isoarsinolinyl, isobenzofuranyl, isochromenyl, isothiochromenyl, isoindolyl, isophosphindolyl, isophosphinolinyl, isoquinolinyl, isothiazolyl, isoxazolyl, naphthyridinyl, oxazolyl, perimidinyl, phenanthrazinyl, phenanthridinyl, phenanthrolinyl, phenazinyl, phosphanthridinyl, phosphindolyl, phosphindolizinyl, phosphinolizinyl, phthalazinyl, pteridinyl, phthaloperinyl, purinyl, pyranyl, thiopyranal, pyrazinyl, pyrazolyl, pyridazinyl, pyridinyl, pyrindinyl, pyrimidinyl, pyrrolyl, pyrrolizinyl, quinazolinyl, quindolinyl, 1H-quinindolinyl, quinolinyl, quinolizinyl, quinoxalinyl, selenophenyl, thebenidinyl, thiazolyl, thiophenyl, triphenodioxazinyl, triphenodithiazinyl, xanthenyl, chromanyl, thiochromanyl, imidazolidinyl, indolinyl, isochromanyl, isothiochromanyl, isoindolinyl, morpholinyl, piperazinyl, piperidinyl, pyrozolidinyl, pyrrolidinyl, quinuclidinyl, dimethylacridarsinyl, dimethylacridinyl, dimethylacridophosphinyl, dimethyl-1H-acrindolinyl, dimethylanthrazinyl, dimethylanthyridinyl, dimethylarsanthridinyl, dimethylarsindolyl, dimethylarsindolizinyl, dimethylarsinolinyl, dimethylarsinolizinyl, dibutylbenzofuranyl, dibutylcarbazolyl, dibutyl-β-carbolinyl, dibutylchromenyl, dibutylthiochromenyl, butylcinnolinyl, dibutylfuranyl, dimethylimidazolyl, dimethylindazolyl, dipropylindolyl, dipropylindolizinyl, dimethylisoarsindolyl, methylisoarsinolinyl, dimethylisobenzofuranyl, diphenylisochromenyl, dibutylisothiochromenyl, phenylisoindolyl, butylisophosphindolyl, dibutylisophosphinolinyl, dimethylisoquinolinyl, methylisothiazolyl, butylisoxazolyl, butylnaphthyridinyl, dimethyloxazolyl, methylphenylperimidinyl, tetrabutylphenanthrazinyl, propylphenanthridinyl, dibutylphenanthrolinyl, tetramethylphenazinyl, butylphosphanthridinyl, phenylphosphindolyl, dimethylphosphindolizinyl, methylphosphinolizinyl, dibutylphthalazinyl, trimethylpteridinyl, methylphthaloperinyl, dimethylpurinyl, dibutylpyranyl, dibutylthiopyranal, trimethylpyrazinyl, phenylpyrazolyl, dipropylpyridazinyl, dimethylpyridinyl, methylpropylpyrindinyl, triethylpyrimidinyl, dibutylpyrrolyl, diethylpyrrolizinyl, dibutylquinazolinyl, dibutylquindolinyl, dibutyl-1H-quinindolinyl, dimethylquinolinyl, propylquinolizinyl, methylquinoxalinyl, methylbutylselenophenyl, methylthebenidinyl, dimethylthiazolyl, trimethylthiophenyl, dibutyltriphenodioxazinyl, dibutyltriphenodithiazinyl, dibutylxanthenyl, trimethylchromanyl, dimethylthiochromanyl, dimethylimidazolidinyl, dimethylindolinyl, dibutylisochromanyl, dibutylisothiochromanyl, phenylisoindolinyl, dibutylmorpholinyl, dimethylpiperazinyl, dimethylpiperidinyl, dimethylpyrozolidinyl, dimethylpyrrolidinyl, bipyridyl, pyrido[2,1,6-de]quinolizinyl, hexamethylquinuclidinyl, 5,7-dioxa-6-phosphadibenzo[a,c]cycloheptene-6-oxide, 9-oxa-10-phosphaphenanthrene-10-oxide and the like; from all isomers of polar groups including methoxy, ethoxy, propoxy, butoxy, pentoxy, phenoxy, dimethylphenoxy, dimethylamino, diethylamino, dipropylamino, methylethylamino, methylpropylamino, ethylpropylamino, diphenylamino, methylphenylamino, ethylphenylamino, and the like.

In some embodiments of the invention, it is preferred that R¹¹ and/or R¹² are, independently, methyl, ethyl, n-propyl, iso-propyl, n-butyl, sec-butyl, iso-butyl, tert-butyl, phenyl, napthyl, diphenylmethyl, or trifluoromethyl; more preferably R¹¹ and R¹² ar,e independently, methyl, ethyl, n-propyl, iso-propyl, n-butyl, sec-butyl, iso-butyl, tert-butyl, phenyl, napthyl, diphenylmethyl, or trifluoromethyl.

For the production of oligomer, the pre-catalyst structure preferably has R¹¹ or R¹² as hydrogen. Preferably both R¹¹ and R¹² are hydrogen. Additionally, R⁴ is preferably hydrogen, methyl, ethyl, n-propyl, or n-butyl, or R⁴ and the adjacent R² join to form a fused phenyl ring.

For the production of polymer, the pre-catalyst structure preferably has both R¹¹ and R¹² other than hydrogen, however, one R¹¹ or one R¹² may be hydrogen. Additionally, R⁴ is preferably a substituted or unsubstituted phenyl, naphthyl, adamantyl or cyclohexyl substituent.

The transition metal compounds of this invention may be prepared by multiple methods. A first method of preparation uses a zero formal oxidation state transition metal or transition metal complex, such as a metal carbonyl complex, a bidentate or tridentate chelating ligand, and a 1,2-benzoquinone complex to form the complex of the invention. Depending on the metal complex used, the oxidation of the metal may be a one or two electron oxidation. Examples of this redox reaction are illustrated below:

Formation of a nickel (II) complex:

Formation of a cobalt (I) complex:

Zero formal oxidation state transition metals or transition metal complexes that may be used include nickel carbonyl (Ni(CO)₄), bis(1,5-cyclooctadiene)nickel, bis(triphenylphosphine)nickel dicarbonyl, tetrakis(trifluorophosphine)nickel, nickel powder, tetrakis(thiocarbonyl)nickel, tricarbonyl(methyl isocyanide)nickel, dicarbonyl[bis(trifluoromethyl)acetylene]nickel, bis(acrylonitrile)nickel, dicarbonylbis(methyl isocyanide)nickel, (trimethyl phosphite)nickel tricarbonyl, tris(ethylene)nickel, carbonyltris(methyl isocyanide)nickel, tricarbonyl(diethylsulfide)nickel, tetrakis(methyl isocyanide)nickel, dicarbonylbis(trimethylphosphine)nickel, carbonyltris(trimethylphosphine)nickel, (1,5-cyclooctadiene)(hexafluoropropylene)nickel, tetrakis(trimethylphosphite-P)nickel, tetrakis(trimethylphosphine)nickel, dicarbonylbis(triethylphosphine)nickel, tricarbonyl(tributylphosphine)nickel, tricarbonyl(tri-tert-butylphosphine)nickel, [(1,2,5,6,9,10-η)-1,5,9-cyclododecatriene](trimethylphosphine)nickel, bis(cyclooctatetraene)nickel, bis(tert-butylisocyanide)(tetracyanoethylene)nickel, bis(norbornene)(trimethylphosphine)nickel, (1,5,9-cyclododecatriene)(triethylphosphine)nickel, [hexakis(trifluoromethyl)benzene](1,5-cyclooctadiene)nickel, azobenzene(1,5-cyclooctadiene)nickel, tris(norbornene)nickel, 1,5-cyclooctadiene)(diphenylacetylene)nickel, bis(ethylene)(triphenylphosphine)nickel, bis(ethylene)(tricyclohexylphosphine)nickel, (diphenylacetylene)bis(tert-butyl isocyanide)nickel, tetrakis(triethylphosphite-P)nickel, tetrakis(triethylphosphine)nickel, dicarbonylbis(methyldiphenylphosphine)nickel, tetrakis(isocyanocyclohexane)nickel, hexacarbonylbis[μ-(diphenylphosphino)]dinickel, [(1,2,5,6,9,10-η)-1,5,9-cyclododecatriene](triphenylphosphine)nickel, tetrakis(dimethylphenylphosphine)nickel, bis(tributylphosphine)(1,5-cyclooctadiene)nickel, (triphenylphosphine)bis(1,5-cyclooctadiene)nickel, tricyclohexylphosphine)bis(3-vinylcyclohexene)nickel, dicarbonylbis(triphenylarsine)nickel, dicarbonylbis(triphenylphosphine)nickel, dicarbonylbis(triphenylstibine)nickel, dicarbonyl(triphenylphosphine)(triphenylphosphite-P)nickel, dicarbonylbis(triphenylphosphite-P)nickel, (1,1-difluoroethylene)bis(triphenylphosphine)nickel, ethylenebis(triphenylphosphine)nickel, dicarbonylbis(tricyclohexylphosphine)nickel, ethylenebis(tricyclohexylphosphine)nickel, (dimethylacetylene)bis(triphenylphosphine)nickel, tetrakis(diethylphenylphosphonite-P)nickel, tetrakis(diethylphenylphosphine)nickel, [(2,3-η)-2-butene]bis(tricyclohexylphosphine)nickel, tris(stilbene)nickel, [(2,3-η)-dimethyl-2-butenedioate]bis(triphenylphosphine)nickel, styrenebis(triphenylphosphine)nickel, [(1,2,5,6-η)-1,5-cyclooctadiene]bis(triphenylphosphine)nickel, ethylenebis[tris(2-methylphenyl)phosphite-P]nickel, diphenylethylenebis(triphenylphosphine)nickel, tetrakis(methyldiphenylphosphinite-P)nickel, tetrakis(methyldiphenylphosphine)nickel, tris(triphenylphosphine)nickel, carbonyltris(triphenylphosphine)nickel, carbonyltris(triphenylphosphite-P)nickel, tris[tris(4-methylphenyl)phosphine]nickel, tetrakis(triphenylarsine)nickel, tetrakis(triphenylphosphite-P)nickel, tetrakis(triphenylphosphine)nickel, bis(ethylene)nickel, bis(ethylene)trimethylphoshinenickel, (acetylene)bis(trimethylphosphine)nickel, (acetylene)bis(triphenylphosphine)nickel, (2-butyne)bis(triphenylphosphine)nickel, bis(triethylphosphine)(1,5-cyclooctadiene)nickel, cobalt carbonyl (Co₂(CO)₈, Co₄(CO)₁₂ and Co₆(CO)₁₆), cobalt tricarbonyl nitrosyl, cobalt powder, octacarbonyl[μ-(1,1,2,2-tetrafluoro-1,2-ethanediyl)]dicobalt, heptacarbonyl(trimethyl phosphite)dicobalt, nitrosylbis(tert-butyl isocyanide)carbonylcobalt, bis(1,3-butadiene)tetracarbonyldicobalt, hexacarbonyl(2,5-norbornadiene)dicobalt, μ-cyclooctynehexacarbonyldicobalt, pentacarbonyltris(trimethylphosphine)dicobalt, (η⁶-benzene)nonacarbonyltetracobalt, tri-tert-butylisocyanidenitrosylcobalt, tetracarbonylbis(1,4-cyclohexadiene)dicobalt, di-μ-carbonyldicarbonylbis[(1,2,3,4-η)-2,3-dimethyl-1,3-butadiene]dicobalt, tetracarbonyltetrakis(trimethylphosphine)dicobalt, tetracarbonylbis(2,5-norbornadiene)dicobalt, nitrosyldicarbonyl(triphenylphosphine)cobalt, octacarbonyltetrakis(trimethyl phosphite-P)tetracobalt, heptacarbonyl(triphenylphosphine)dicobalt, undecacarbonyl(triphenylphosphine)tetracobalt, hexacarbonylbis(tributylphosphine)dicobalt, carbonylnitrosylbis(triphenylphosphine)cobalt, hexacarbonylbis(triphenylphosphine)dicobalt, hexacarbonylbis(triphenylphosphite)dicobalt, (ethylene)tris(triphenylphosphine)cobalt, tris(dicarbonyltriphenylphosphinecobalt), tetracarbonyltetrakis(triphenylphosphite)dicobalt, dicarbonylhexakis(triphenylphosphine)dicobalt, (1,5-cyclooctadiene)bis(trimethylphosphine)cobalt, cyclopentenebis(trimethylphosphine)cobalt, (2,5-norbornene)tris(trimethylphosphine)cobalt, nitrosyltris(triphenylphosphine)cobalt, iron carbonyl (Fe(CO)₅, Fe₃(CO)₁₂ and Fe₂(CO)₉), cyclohexadiene iron tricarbonyl, cyclooctatetrene iron tricarbonyl, iron powder, carbonyltetrakis(trifluorophosphine)iron, dicarbonyltris(trifluorophosphine)iron, dicarbonyldinitrosyliron, tricarbonylbis(trifluorophosphine)iron, acrylonitrileirontetrakis(trifluorophosphine), tetracarbonyl(trichlorophosphine)iron, tetracarbonyl(phosphine)iron, (η⁴-1,3-butadiene)tris(trifluorophosphine)iron, bis(methyl isocyanide)dinitrosyliron, carbonyldinitrosyl(trimethyl phosphite-P)iron, (carbonothioyl)tetracarbonyliron, (carbon disulfide)tetracarbonyliron, tetracarbonyl(tetrafluoroethylene)iron, (bromoethylene)tetracarbonyliron, (vinyl chloride)iron tetracarbonyl, tetracarbonyl(methyl isocyanide)iron, tetracarbonyl(ethylene)iron, (vinyl alcohol)iron tetracarbonyl, (η⁶-benzene)bis(trifluorophosphine)iron, dinitrosylbis(trimethyl phosphite-P)iron, tricarbonyl(η⁴-1,2-dichloro-1,3-butadiene)iron, tricarbonyl(η⁴-1,4-dichloro-1,3-butadiene)iron, tricarbonyl(η⁴-2,4-dichloro-1,3-butadiene)iron, (acrylic acid)tetracarbonyliron, tricarbonyl(η⁴-1-bromo-1,3-butadiene)iron, tricarbonyl(η⁴-2-bromo-1,3-butadiene)iron, tricarbonyl(η⁴-1-chloro-1,3-butadiene)iron, tricarbonyl(η⁴-2-chloro-1,3-butadiene)iron, tricarbonylbis(methyl isocyanide)iron, (η⁴-1,3-butadiene)tricarbonyliron, tetracarbonyl(trimethylphosphine)iron, tetracarbonyl(trimethylamine)iron, tetracarbonyl(trimethylstibine)iron, tetracarbonyl(trimethyl phosphite-P)iron, tricarbonyl[(1,2,3,4-η)-1,3-cyclopentadiene]iron, [(1,2-η)-1,3-butadiene]tetracarbonyliron, tricarbonyl[(1,2,3,4-η)-2-methyl-1,3-cyclopentadiene]iron, bis(η⁴-1,3-butadiene)(trifluorophosphine)iron, tricarbonyl(2,4-hexadienedinitrile)iron, tricarbonyl(1,2,3,4-η)-1,3-cyclohexadieneiron, tricarbonyl(1,2,3,4-η)-1,3,5-hexatrieneiron, tricarbonyl[(1,2,3,4-η)-2,3-dimethyl-1,3-butadiene]iron, tricarbonyl[(1,2,3,4-η)-1,3-hexadiene)]iron, tricarbonyl[(1,2,3,4-η)-2,4-hexadiene)]iron, tricarbonyl[(1,2,3,4-η)-2-methyl-1,3-pentadiene)]iron, tricarbonyl[(1,2,3,4-η)-3-methyl-1,3-pentadiene)]iron, tricarbonyl[(1,2,3,4-η)-4-methyl-1,3-pentadiene)]iron, tricarbonylbis(trimethylphosphine)iron, tricarbonylbis(trimethylstibine)iron, tricarbonylbis(trimethyl phosphite-P)iron, tetracarbonyl[tetrakis(trifluoromethyl)ethylene]iron, tricarbonyl(tropone)iron, tricarbonyl(4,6-cycloheptadiene-1,3-dione)iron, tricarbonyl(2,5-norbornadiene)iron, cycloheptatrieneiron tricarbonyl, tricarbonyl(spiro[2.4]hepta-4,6-diene)iron, (η⁴-cyclooctatetraene)tricarbonyliron, tricarbonyl(5,6-dimethylene-1,3-cyclohexadiene)iron, tricarbonyl[(1,2,3,4-η)-1,3-cyclooctadiene]iron, tricarbonyl[(1,2,5,6-η)-1,5-cyclooctadieneiron, tricarbonylbis(methyl acrylate)iron, (η⁴-1,3-butadiene)(η⁶-toluene)iron, (η⁴-1,3-butadiene)carbonyl[(1,2,3,4-η)-1,3,5,7-cyclooctatetraene]iron, (η⁴-1,3-butadiene)tris(trimethylphosphine)iron, (η⁴-1,3-butadiene)tris(trimethyl phosphite-P)iron, hexacarbonyl[μ-(1,2,3,4-η:5,6,7,8-η)-1,3,5,7-cyclooctatetraene]]diiron, (η⁶-benzene[(1,2,3,4-η)-1,3,5,7-cyclooctatetraene]iron, tricarbonylbis(triethylphosphine)iron, tricarbonylbis(triethyl phosphite-P)iron, bis[1,2,5,6-η)-1,5-cyclooctadiene]iron, (η⁶-hexamethylbenzene)[(1,2,3,4-η)-1,3,5,7-cyclooctatetraene)iron, (η⁶-hexamethylbenzene)[1,2,5,6-η)-1,5-cyclooctadiene]iron, bis(η⁶-hexamethylbenzene)iron, bis(1,3-butadiene)trimethylphosphineiron, (1,5-cyclooctadiene)tricarbonyliron, copper powder, copper carbonyl (CuCO, Cu(CO)₂ and Cu(CO)₃), palladium powder, bis(tri-tert-butylphosphine)palladium, bis(tricyclohexylphosphine)palladium, tetrakis(triphenylphosphine)palladium, tris(dibenzylideneacetone)dipalladium, palladium carbonyl (Pd(CO)₄), dicarbonyl(hexafluoro-2-butyne)palladium, tris(ethylene)palladium, bis(tert-butylisocyanide)palladium, bis(phenylisocyanide)palladium, bis(cyclohexylisocyanide)palladium, bis(1,5-cyclooctadiene)palladium, [bis(trifluoromethyl)acetylene]bis(dimethylphenylphosphine)palladium, bis(tri-tert-butylphosphine)palladium, tetrakis(triethylphosphite-P)palladium, bis(dibenzylideneacetone)palladium, bis(methyldiphenylphosphine)(styrene)palladium, ethylenebis(triphenylphosphine)palladium, ethylenebis(tricyclohexylphosphine)palladium, bis(triphenylphosphine)hexafluoro-2-butynepalladium, 9maleic anhydride)bis(triphenylphosphine)palladium, ethylenebis([tris(2-methylphenyl)phosphite-P]palladium, tris(dibenzylideneacetone)palladium, tris(k-dibenzylideneacetone)dipalladium, carbonyltris(triphenylphosphine)palladium, tetrakis(triphenylarsine)palladium, bis(triphenylphosphine)bis(triphenylplumbyl)palladium, tetrakis(triphenylstibine)palladium, tetrakis(trifluorophosphine)palladium, platinum powder, tetrakis(trifluorophosphine)platinum, tetrakis(triphenylphosphine)platinum, platinum tetracarbonyl, tris(ethylene)platinum, bis(ethylene)(trimethylphosphine)platinum, ethylenebis(trimethylphosphine)platinum, dimethylbis(trimethylarsine)platinum, hexafluoro-2-butyne(1,5-cyclooctadiene)platinum, dicarbonylbis(triethylphosphine)platinum, ethylenebis(triethylphosphine)platinum, bis(1,5-cycloocadiene)platinum, bis(triethylphosphine)hexafluoro-2-butyneplatinum, bis(dimethylphenylphosphine)(tetrafluoroethylene)platinum, tris(triethylphosphine)platinum, carbonyltris(triethylphosphine)platinum, diphenylacetylene)bis(trimethylphosphine)platinum, bis(ethylene)(triphenylphosphine)platinum, bis(ethylene)(triphenylarsine)platinum, bis(ethylene)(tricyclohexylphosphine)platinum, bis(tris-tert-butylphosphine)platinum, tetrakis(triethylphosphite-P)platinum, tetrakis(triethylphosphine)platinum, tris(tri-iso-propylphosphine)platinum, bis(diphenylacetylene)platinum, bis(dibenzylideneacetone)platinum, bis(tricyclohexylphosphine)platinum, (carbon oxysulfide)bis(triphenylphosphine)platinum, (carbon disulfide-C,S)bis(triphenylphosphine)platinum, bis(triphenylphosphine)(carbon diselenide)platinum, (trifluoroacetonitrile)bis(triphenylphosphine)platinum, (tetrafluoroethylene)bis(triphenylphosphine)platinum, dicarbonylbis(triphenylphosphine)platinum, acetylenebis(triphenylphosphine)platinum, ethylenebis(triphenylphosphine)platinum, [(1,2-η)-cyclohexyne]bis(triphenylphosphine)platinum, [(1,2-η)-cycloheptyne]bis(triphenylphosphine)platinum, [(1,2-η)-cyclooctyne]bis(triphenylphosphine)platinum, diphenylacetylenebis(triphenylphosphine)platinum, silver powder, silver carbonyl (AgCO, Ag(CO)₂ and Ag(CO)₃), gold powder, gold carbonyl (AuCO and Au(CO)₂), ruthenium powder, ruthenium carbonyl (Ru₃(CO)₁₂ and Ru(CO)₅), tricarbonylbis(triphenylphosphine)ruthenium, rhodium powder, rhenium powder, rhenium carbonyl (Re₂(CO)₁₀), osmium powder, osmium carbonyl (Os₃(CO)₁₂ and Os(CO)₅), iridium powder, iridium carbonyl (Ir₄(CO)₁₂), and the like.

Preferred zero formal oxidation state transition metals or transition metal complexes include nickel carbonyl (Ni(CO)₄), bis(1,5-cyclooctadiene)nickel, tris(ethylene)nickel, bis(cyclooctatetraene)nickel, tris(norbornene)nickel, (1,5-cyclooctadiene)(diphenylacetylene)nickel, nickel powder, cobalt carbonyl (Co₂(CO)₈ Co₄(CO)₁₂ and Co₆(CO)₁₆), cobalt tricarbonyl nitrosyl, bis(1,3-butadiene)tetracarbonyldicobalt, hexacarbonyl(2,5-norbornadiene)dicobalt, (η⁶-benzene)nonacarbonyltetracobalt, cobalt powder, iron carbonyl (Fe(CO)₅, Fe₃(CO)₁₂ and Fe₂(CO)₉), cyclohexadiene iron tricarbonyl, cyclooctatetrene iron tricarbonyl, tetracarbonyl(ethylene)iron, iron powder, copper powder, copper carbonyl (CuCO, Cu(CO)₂ and Cu(CO)₃), palladium powder, tris(dibenzylideneacetone)dipalladium, palladium carbonyl (Pd(CO)₄), tris(ethylene)palladium, bis(1,5-cyclooctadiene)palladium, platinum powder, platinum tetracarbonyl, tris(ethylene)platinum, silver powder, silver carbonyl (AgCO, Ag(CO)₂ and Ag(CO)₃), gold power, gold carbonyl (AuCO and Au(CO)₂), ruthenium powder, ruthenium carbonyl (Ru₃(CO)₁₂ and Ru(CO)₅), rhodium powder, rhenium powder, rhenium carbonyl (Re₂(CO)₁₀), osmium power, osmium carbonyl (Os₃(CO)₁₂ and Os(CO)₅), iridium powder, iridium carbonyl (Ir₄(CO)₁₂), and the like.

Most preferred zero formal oxidation state transition metals or transition metal complexes include nickel carbonyl (Ni(CO)₄), bis(1,5-cyclooctadiene)nickel, nickel powder, cobalt carbonyl (Co₂(CO)₈ Co₄(CO)₁₂ and Co₆(CO)₁₆), cobalt tricarbonyl nitrosyl, cobalt powder, iron carbonyl (Fe(CO)₅, Fe₃(CO)₁₂ and Fe₂(CO)₉), cyclohexadiene iron tricarbonyl, cyclooctatetrene iron tricarbonyl, iron powder, copper powder, copper carbonyl (CuCO, Cu(CO)₂ and Cu(CO)₃), palladium powder, tris(dibenzylideneacetone)dipalladium, palladium carbonyl (Pd(CO)₄), platinum powder, platinum tetracarbonyl, silver powder, silver carbonyl (AgCO, Ag(CO)₂ and Ag(CO)₃), gold power, gold carbonyl (AuCO and Au(CO)₂), ruthenium powder, ruthenium carbonyl (Ru₃(CO)₁₂ and Ru(CO)₅), rhodium powder, rhenium powder, rhenium carbonyl (Re₂(CO)₁₀), osmium power, osmium carbonyl (Os₃(CO)₁₂ and Os(CO)₅), iridium powder, iridium carbonyl (Ir₄(CO)₁₂), and the like.

Substituted or unsubstituted 1,2-benzoquinones may be used. Preferred 1,2-benzoquinones include 3,6-di-tert-butyl-1,2-benzoquinone, 3,6-di-tert-butyl-4-chloro-1,2-benzoquinone, 3,6-di-tert-butyl-4,5-dichloro-1,2-benzoquinone, 3,6-di-tert-butyl-4-bromo-1,2-benzoquinone, 3,6-di-tert-butyl-4,5-dibromo-1,2-benzoquinone, 3,6-di-tert-butyl-4-fluoro-1,2-benzoquinone, 3,6-di-tert-butyl-4,5-difluoro-1,2-benzoquinone, 3,6-di-tert-butyl-4-methoxy-1,2-benzoquinone, 3,6-di-tert-butyl-4,5-dimethoxy-1,2-benzoquinone, 3,6-di-tert-butyl-4-ethoxy-1,2-benzoquinone, 3,6-di-tert-butyl-4,5-diethoxy-1,2-benzoquinone, 3,6-di-tert-butyl-4-propoxy-1,2-benzoquinone, 3,6-di-tert-butyl-4,5-dipropoxy-1,2-benzoquinone, 3,6-di-tert-butyl-4-butoxy-1,2-benzoquinone, 3,6-di-tert-butyl-4,5-dibutoxy-1,2-benzoquinone, 3,6-di-tert-butyl-4-iso-propyl-1,2-benzoquinone, 3,6-di-tert-butyl-4,5-di-iso-propyl-1,2-benzoquinone, 3,6-di-tert-butyl-4-cyclohexyl-1,2-benzoquinone, 3,5-di-tert-butyl-1,2-benzoquinone, 3,5-di-tert-butyl-6-chloro-1,2-benzoquinone, 3,5-di-tert-butyl-6-bromo-1,2-benzoquinone, 3,5-di-tert-butyl-6-fluoro-1,2-benzoquinone, 3,5-di-tert-butyl-6-nitro-1,2-benzoquinone, 3,4,6-tri-iso-propyl-1,2-benzoquinone, 3,4,5,6-tetra-iso-propyl-1,2-benzoquinone 3,6-di-iso-propyl-1,2-benzoquinone, 1,4,6,8-tetra-tert-butyldibenzo[1,4]dioxine-2,3-dione, 1,4,6,7,8,9-hexachlorodibenzo[1,4]dioxine-2,3-dione, 1,4,6,7,8,9-hexabromodibenzo[1,4]dioxine-2,3-dione, 3,6-di-n-butyl-1,2-benzoquinone, 3,6-di-n-butyl-4-chloro-1,2-benzoquinone, 3,6-di-n-butyl-4,5-dichloro-1,2-benzoquinone, 3,6-di-n-butyl-4-bromo-1,2-benzoquinone, 3,6-di-n-butyl-4,5-dibromo-1,2-benzoquinone, 3,6-di-n-butyl-4-fluoro-1,2-benzoquinone, 3,6-di-n-butyl-4,5-difluoro-1,2-benzoquinone, 3,6-di-n-butyl-4-methoxy-1,2-benzoquinone, 3,6-di-n-butyl-4,5-dimethoxy-1,2-benzoquinone, 3,6-di-n-butyl-4-ethoxy-1,2-benzoquinone, 3,6-di-n-butyl-4,5-diethoxy-1,2-benzoquinone, 3,6-di-n-butyl-4-propoxy-1,2-benzoquinone, 3,6-di-n-butyl-4,5-dipropoxy-1,2-benzoquinone, 3,6-di-n-butyl-4-butoxy-1,2-benzoquinone, 3,6-di-n-butyl-4,5-dibutoxy-1,2-benzoquinone, 3,6-di-n-butyl-4-iso-propyl-1,2-benzoquinone, 3,6-di-n-butyl-4,5-di-iso-propyl-1,2-benzoquinone, 3,6-di-n-butyl-4-cyclohexyl-1,2-benzoquinone, 3,5-di-n-butyl-1,2-benzoquinone, 3,5-di-n-butyl-6-chloro-1,2-benzoquinone, 3,5-di-n-butyl-6-bromo-1,2-benzoquinone, 3,5-di-n-butyl-6-fluoro-1,2-benzoquinone, 3,5-di-n-butyl-6-nitro-1,2-benzoquinone, 1,4,6,8-tetra-n-butyldibenzo[1,4]dioxine-2,3-dione, 3,6-di-iso-butyl-1,2-benzoquinone, 3,6-di-iso-butyl-4-chloro-1,2-benzoquinone, 3,6-di-iso-butyl-4,5-dichloro-1,2-benzoquinone, 3,6-di-iso-butyl-4-bromo-1,2-benzoquinone, 3,6-di-iso-butyl-4,5-dibromo-1,2-benzoquinone, 3,6-di-iso-butyl-4-fluoro-1,2-benzoquinone, 3,6-di-iso-butyl-4,5-difluoro-1,2-benzoquinone, 3,6-di-iso-butyl-4-methoxy-1,2-benzoquinone, 3,6-di-iso-butyl-4,5-dimethoxy-1,2-benzoquinone, 3,6-di-iso-butyl-4-ethoxy-1,2-benzoquinone, 3,6-di-iso-butyl-4,5-diethoxy-1,2-benzoquinone, 3,6-di-iso-butyl-4-propoxy-1,2-benzoquinone, 3,6-di-iso-butyl-4,5-dipropoxy-1,2-benzoquinone, 3,6-di-iso-butyl-4-butoxy-1,2-benzoquinone, 3,6-di-iso-butyl-4,5-dibutoxy-1,2-benzoquinone, 3,6-di-iso-butyl-4-iso-propyl-1,2-benzoquinone, 3,6-di-iso-butyl-4,5-di-iso-propyl-1,2-benzoquinone, 3,6-di-iso-butyl-4-cyclohexyl-1,2-benzoquinone, 3,5-di-iso-butyl-1,2-benzoquinone, 3,5-di-iso-butyl-6-chloro-1,2-benzoquinone, 3,5-di-iso-butyl-6-bromo-1,2-benzoquinone, 3,5-di-iso-butyl-6-fluoro-1,2-benzoquinone, 3,5-di-iso-butyl-6-nitro-1,2-benzoquinone, 1,4,6,8-tetra-iso-butyldibenzo[1,4]dioxine-2,3-dione, 3,6-di-iso-propyl-1,2-benzoquinone, 3,6-di-iso-propyl-4-chloro-1,2-benzoquinone, 3,6-di-iso-propyl-4,5-dichloro-1,2-benzoquinone, 3,6-di-iso-propyl-4-bromo-1,2-benzoquinone, 3,6-di-iso-propyl-4,5-dibromo-1,2-benzoquinone, 3,6-di-iso-propyl-4-fluoro-1,2-benzoquinone, 3,6-di-iso-propyl-4,5-difluoro-1,2-benzoquinone, 3,6-di-iso-propyl-4-methoxy-1,2-benzoquinone, 3,6-di-iso-propyl-4,5-dimethoxy-1,2-benzoquinone, 3,6-di-iso-propyl-4-ethoxy-1,2-benzoquinone, 3,6-di-iso-propyl-4,5-diethoxy-1,2-benzoquinone, 3,6-di-iso-propyl-4-propoxy-1,2-benzoquinone, 3,6-di-iso-propyl-4,5-dipropoxy-1,2-benzoquinone, 3,6-di-iso-propyl-4-butoxy-1,2-benzoquinone, 3,6-di-iso-propyl-4,5-dibutoxy-1,2-benzoquinone, 3,6-di-iso-propyl-4-cyclohexyl-1,2-benzoquinone, 3,5-di-iso-propyl-1,2-benzoquinone, 3,5-di-iso-propyl-6-chloro-1,2-benzoquinone, 3,5-di-iso-propyl-6-bromo-1,2-benzoquinone, 3,5-di-iso-propyl-6-fluoro-1,2-benzoquinone, 3,5-di-iso-propyl-6-nitro-1,2-benzoquinone, 1,4,6,8-tetra-iso-propyldibenzo[1,4]dioxine-2,3-dione, 3,6-dimethyl-1,2-benzoquinone, 3,6-dimethyl-4-chloro-1,2-benzoquinone, 3,6-dimethyl-4,5-dichloro-1,2-benzoquinone, 3,6-dimethyl-4-bromo-1,2-benzoquinone, 3,6-dimethyl4,5-dibromo-1,2-benzoquinone, 3,6-dimethyl-4-fluoro-1,2-benzoquinone, 3,6-dimethyl-4,5-difluoro-1,2-benzoquinone, 3,6-dimethyl-4-methoxy-1,2-benzoquinone, 3,6-dimethyl-4,5-dimethoxy-1,2-benzoquinone, 3,6-dimethyl-4-ethoxy-1,2-benzoquinone, 3,6-dimethyl-4,5-diethoxy-1,2-benzoquinone, 3,6-dimethyl-4-propoxy-1,2-benzoquinone, 3,6-dimethyl-4,5-dipropoxy-1,2-benzoquinone, 3,6-dimethyl-4-butoxy-1,2-benzoquinone, 3,6-dimethyl-4,5-dibutoxy-1,2-benzoquinone, 3,6-dimethyl-4-iso-propyl-1,2-benzoquinone, 3,6-dimethyl-4,5-di-iso-propyl-1,2-benzoquinone, 3,6-dimethyl-4-cyclohexyl-1,2-benzoquinone, 3,5-dimethyl-1,2-benzoquinone, 3,5-dimethyl-6-chloro-1,2-benzoquinone, 3,5-dimethyl-6-bromo-1,2-benzoquinone, 3,5-dimethyl-6-fluoro-1,2-benzoquinone, 3,5-dimethyl-6-nitro-1,2-benzoquinone, 1,4,6,8-tetramethyldibenzo[1,4]dioxine-2,3-dione, 3,6-di-n-propyl-1,2-benzoquinone, 3,5-di-n-propyl-1,2-benzoquinone, naphthalene-2,3-dione, phenanthrene-9,10-dione, 3,4,5,6-tetrachloro-1,2-benzoquinone, 3,6-dichloro-1,2-benzoquinone, and 4-methyl-1,2-benzoquinone.

Preferred bidentate and tridentate chelating ligands are those of formulae L*1 to L*410, inclusive. Most preferred bidentate and tridentate chelating ligands are selected from the group IOTA-LIGANDS which defined to be:

-   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-I,4-diaza-1,3-butadiene], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene)], -   [1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene), -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene], -   [2-methyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene], -   [2-methyl-3-propyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene], -   [1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene], -   [2-methyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene], -   [2-methyl-3-propyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene], -   [1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene], -   [2-methyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene], -   [2-methyl-3-propyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene], -   [1,2-bis-(2,6-dimethylphenylimino)-cyclohexane], -   [2,3-bis-(2,6-dimethylphenylimino)-[1,4]dithiane], -   [2,3-bis-(2,6-dimethylphenylimino)-piperazine], -   [1,4-dimethyl-2,3-bis-(2,6-dimethylphenylimino)-piperazine], -   [2,3-bis-(2,6-dimethylphenylimino)-bicyclo[2.2.1]-heptane], -   [1,4-dimethyl-2,3-bis-(2,6-dimethylphenylimino)-[1,4]diazepane], -   [1-methyl-2,3-bis-(2,6-dimethylphenylimino)-cyclopentane], -   [5-methyl-2,3-bis-(2,6-dimethylphenylimino)-tetrahydrofuran], -   [5-methyl-2,3-bis-(2,6-dimethylphenylimino)-2,3-dihydrohydrofuran], -   [1,2-bis-(2,6-di-iso-propylphenylimino)-cyclohexane], -   [2,3-bis-(2,6-di-iso-propylphenylimino)-[1,4]dithiane], -   [2,3-bis-(2,6-di-iso-propylphenylimino)-piperazine], -   [1,4-dimethyl-2,3-bis-(2,6-di-iso-propylphenylimino)-piperazine], -   [2,3-bis-(2,6-di-iso-propylphenylimino)-bicyclo[2.2.1 ]-heptane], -   [1,4-dimethyl-2,3-bis-(2,6-di-iso-propylphenylimino)-[1,4]diazepane], -   [1-methyl-2,3-bis-(2,6-di-iso-propylphenylimino)-cyclopentane], -   [5-methyl-2,3-bis-(2,6-di-iso-propylphenylimino)-tetrahydrofuran], -   [5-methyl-2,3-bis-(2,6-di-iso-propylphenylimino)-2,3-dihydrohydrofuran], -   [1-(2,6-di-iso-propylphenylimino)-2-(2,6-dimethylphenylimino)-cyclohexane], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-[1,4]dithiane], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-piperazine], -   [1,4-dimethyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-piperazine], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-bicyclo[2.2.1]-heptane], -   [1,4-dimethyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-[1,4]diazepane], -   [1-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-cyclopentane], -   [5-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-tetrahydrofuran], -   [5-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-2,3-dihydrohydrofuran], -   [1-(2,6-di-iso-propylphenylimino)-2-(2,5-di-tert-butylphenylimino)-cyclohexane], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-[1,4]dithiane], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenytimino)-piperazine], -   [1,4-dimethyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-piperazine), -   [2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-bicyclo[2.2.1]-heptane], -   [1,4-dimethyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-[1,4]diazepane], -   [1-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-cyclopentane], -   [5-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-tetrahydrofuran], -   [5-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-2,3-dihydrohydrofuran], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4,6-trimethylbenzenamine], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-methylbenzenamine], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-dimethylbenzenamine], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4-dimethylbenzenamine], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-di-iso-propylbenzenamine], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-di-iso-propyl-4-methylbenzenamine], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-4-methylbenzenamine], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-6-methylbenzenamine], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-benzenamine], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4,6-triethylbenzenamine], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-ethylbenzenamine], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-diethylbenzenamine], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4-diethylbenzenamine], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-di-iso-propyl-4-ethylbenzenamine], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-4-ethylbenzenamine], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-6-ethylbenzenamine], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2,4,6-trimethylbenzenamine], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2-methylbenzenamine], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2,6-dimethylbenzenamine], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2,4-dimethylbenzenamine], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2,6-di-iso-propylbenzenamine], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2,6-di-iso-propyl-4-methylbenzenamine], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2-iso-propyl-4-methylbenzenamine], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2-iso-propyl-6-methylbenzenamine], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2-iso-propylbenzenamine], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[benzenamine], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2-iso-propylbenzenamine], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2-iso-propyl-6-methylbenzenamine], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2-iso-propyl-4-methylbenzenamine], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2,6-di-iso-propyl-4-methylbenzenamine], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2,6-di-iso-propylbenzenamine], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2,4-dimethylbenzenamine], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2,6-dimethylbenzenamine], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2-methylbenzenamine], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2,4,6-trimethylbenzenamine], -   N,N′-(2,6-pyridinediyldiethylidyne)[2-methylbenzenamine][2-iso-propylbenzenamine], -   N,N′-(2,6-pyridinediyldiethylidyne)[2-methylbenzenamine][2-iso-propyl-6-methylbenzenamine], -   N,N′-(2,6-pyridinediyldiethylidyne)[2-methylbenzenamine][2-iso-propyl-4-methylbenzenamine], -   N,N′-(2,6-pyridinediyldiethylidyne)[2-methylbenzenamine][2,6-di-iso-propyl-4-methylbenzenamine], -   N,N′-(2,6-pyridinediyldiethylidyne)[2-methylbenzenamine][2,6-di-iso-propylbenzenamine], -   N,N′-(2,6-pyridinediyldiethylidyne)[2-methylbenzenamine][2,4-dimethylbenzenamine], -   N,N′-(2,6-pyridinediyldiethylidyne)[2-methylbenzenamine][2,6-dimethylbenzenamine], -   N,N′-(2,6-pyridinediyldiethylidyne)[2-methylbenzenamine][2,4,6-trimethylbenzenamine], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2,4,6-trimethylbenzenamine], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2-methylbenzenamine], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2,6-dimethylbenzenamine], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2,4-dimethylbenzenamine], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2,6-di-iso-propylbenzenamine], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2,6-di-iso-propyl-4-methylbenzenamine], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2-iso-propyl-4-methylbenzenamine], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2-iso-propyl-6-methylbenzenamine], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2-iso-propyl-benzenamine], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2-ethylbenzenamine), -   N,N′-(2,6-pyrazinediyldiethylidyne)bis[2,4,6-trimethylbenzenamine], -   N,N′-(2,6-pyrazinediyldiethylidyne)bis[2-methylbenzenamine], -   N,N′-(2,6-pyrazinediyldiethylidyne)bis[2,6-dimethylbenzenamine], -   N,N′-(2,6-pyrazinediyldiethylidyne)bis[2,4-dimethylbenzenamine], -   N,N′-(2,6-pyrazinediyldiethylidyne)bis[2,6-di-iso-propylbenzenamine], -   N,N′-(2,6-pyrazinediyldiethylidyne)bis[2,6-di-iso-propyl-4-methylbenzenamine], -   N,N′-(2,6-pyrazinediyldiethylidyne)bis[2-iso-propyl-4-methylbenzenamine], -   N,N′-(2,6-pyrazinediyldiethylidyne)bis[2-iso-propyl-6-methylbenzenamine], -   N,N′-(2,6-pyrazinediyldiethylidyne)bis[2-iso-propyl-benzenamine], -   N,N′-(2,6-pyrazinediyldiethylidyne)bis[2,4,6-triethylbenzenamine], -   N,N′-(2,6-pyrimidinediyldiethylidyne)bis[2,4,6-trimethylbenzenamine], -   N,N′-(2,6-pyrimidinediyldiethylidyne)bis[2-methylbenzenamine], -   N,N′-(2,6-pyrimidinediyldiethylidyne)bis[2,6-dimethylbenzenamine], -   N,N′-(2,6-pyrimidinediyldiethylidyne)bis[2,4-dimethylbenzenamine], -   N,N′-(2,6-pyrimidinediyldiethylidyne)bis[2,6-di-iso-propylbenzenamine, -   N,N′-(2,6-pyrimidinediyldiethylidyne)bis[2,6-di-iso-propyl-4-methylbenzenamine, -   N,N′-(2,6-pyrimidinediyldiethylidyne)bis[2-iso-propyl-4-methylbenzenamine], -   N,N′-(2,6-pyrimidinediyldiethylidyne)bis[2-iso-propyl-6-methylbenzenamine], -   N,N′-(2,6-pyrimidinediyldiethylidyne)bis[2-iso-propyl-benzenamine], -   N,N′-(2,6-pyrimidinediyldiethylidyne)bis[2,4,6-triethylbenzenamine], -   N,N′-(2,6-[1,3,5]triazinediyldiethylidyne)bis[2,4,6-trimethylbenzenamine], -   N,N′-(2,6-[1,3,5]triazinediyldiethylidyne)bis[2-methylbenzenamine], -   N,N′-(2,6-[1,3,5]triazinediyldiethylidyne)bis[2,6-dimethylbenzenamine], -   N,N′-(2,6-[1,3,5]triazinediyldiethylidyne)bis[2,4-dimethylbenzenamine], -   N,N′-(2,6-[1,3,5]triazinediyldiethylidyne)bis[2,6-di-iso-propylbenzenamine], -   N,N′-(2,6-[1,3,5]triazinediyldiethylidyne)bis[2,6-di-iso-propyl-4-methylbenzenamine], -   N,N′-(2,6-[1,3,5]triazinediyldiethylidyne)bis[2-iso-propyl-4-methylbenzenamine], -   N,N′-(2,6-[1,3,5]triazinediyldiethylidyne)bis[2-iso-propyl-6-methylbenzenamine], -   N,N′-(2,6-[1,3,5]triazinediyldiethylidyne)bis[2-iso-propyl-benzenamine], -   N,N′-(2,6-[1,3,5]triazinediyldiethylidyne)bis[2,4,6-triethylbenzenamine], -   N,N′-(2,5-furandiyldiethylidyne)bis[2,4,6-trimethylbenzenamine], -   N,N′-(2,5-furandiyldiethylidyne)bis[2-methylbenzenamine], -   N,N′-(2,5-furandiyldiethylidyne)bis[2,6-dimethylbenzenamine], -   N,N′-(2,5-furandiyldiethylidyne)bis[2,4-dimethylbenzenamine], -   N,N′-(2,5-furandiyldiethylidyne)bis[2,6-di-iso-propylbenzenamine], -   N,N′-(2,5-frandiyldiethylidyne)bis[2,6-di-iso-propyl-4-methylbenzenamine], -   N,N′-(2,5-furandiyldiethylidyne)bis[2-iso-propyl-4-methylbenzenamine], -   N,N′-(2,5-furandiyldiethylidyne)bis[2-iso-propyl-6-methylbenzenamine], -   N,N′-(2,5-furandiyldiethylidyne)bis[2-iso-propyl-benzenamine], -   N,N′-(2,5-furandiyldiethylidyne)bis[2,4,6-triethylbenzenamine], -   N,N′-(2,5-thiophenediyldiethylidyne)bis[2,4,6-trimethylbenzenamine], -   N,N′-(2,5-thiophenediyldiethylidyne)bis[2-methylbenzenamine], -   N,N′-(2,5-thiophenediyldiethylidyne)bis[2,6-dimethylbenzenamine], -   N,N′-(2,5-thiophenediyldiethylidyne)bis[2,4-dimethylbenzenamine], -   N,N′-(2,5-thiophenediyldiethylidyne)bis[2,6-di-iso-propylbenzenamine], -   N,N′-(2,5-thiophenediyldiethylidyne)bis[2,6-di-iso-propyl-4-methylbenzenamine], -   N,N′-(2,5-thiophenediyldiethylidyne)bis[2-iso-propyl-4-methylbenzenamine], -   N,N′-(2,5-thiophenediyldiethylidyne)bis[2-iso-propyl-6-methylbenzenamine], -   N,N′-(2,5-thiophenediyldiethylidyne)bis[2-iso-propyl-benzenamine], -   N,N′-(2,5-thiophenediyldiethylidyne)bis[2,4,6-triethylbenzenamine], -   [2-(N-(2,6-dimethylphenyl)-iminomethyl)-pyridine], -   [2-(N-(2-iso-propyl-6-methylphenyl)-iminomethyl)-pyridine], -   [2-(N-(2,5-di-tert-butylphenyl)-1-iminomethyl)-pyridine], -   [2-(N-(2,6-di-iso-propylphenyl)-1-iminomethyl)-pyridine], -   [2-(N-(2,6-diethylphenyl)-iminomethyl)-pyridine], -   [2-(N-(2,4,6-trimethylphenyl)-iminomethyl)-pyridine], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-iminomethyl)-pyridine], -   [2-(N-(2,6-dimethylphenyl)-imino-2-ethyl)-pyridine], -   [2-(N-(2-iso-propyl-6-methylphenyl)-imino-2-ethyl)-pyridine], -   [2-(N-(2,5-di-tert-butylphenyl)-1-imino-2-ethyl)-pyridine], -   [2-(N-(2,6-di-iso-propylphenyl)-1-imino-2-ethyl)-pyridine], -   [2-(N-(2,6-diethylphenyl)-imino-2-ethyl)-pyridine], -   [2-(N-(2,4,6-trimethylphenyl)-imino-2-ethyl)-pyridine], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-imino-2-ethyl)-pyridine], -   [2-(N-(2,6-dimethylphenyl)-iminomethyl)-pyrazine], -   [2-(N-(2-iso-propyl-6-methylphenyl)-iminomethyl)-pyrazine], -   [2-(N-(2,5-di-tert-butylphenyl)-1-iminomethyl)-pyrazine], -   [2-(N-(2,6-di-iso-propylphenyl)-1-iminomethyl)-pyrazine], -   [2-(N-(2,6-diethylphenyl)-iminomethyl)-pyrazine], -   [2-(N-(2,4,6-trimethylphenyl)-iminomethyl)-pyrazine], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-iminomethyl)-pyrazine], -   [2-(N-(2,6-dimethylphenyl)-imino-2-ethyl)-pyrazine], -   [2-(N-(2-iso-propyl-6-methylphenyl)-imino-2-ethyl)-pyrazine], -   [2-(N-(2,5-di-tert-butylphenyl)-1-imino-2-ethyl)-pyrazine], -   [2-(N-(2,6-di-iso-propylphenyl)-1-imino-2-ethyl)-pyrazine] -   [2-(N-(2,6-diethylphenyl)-imino-2-ethyl)-pyrazine], -   [2-(N-(2,4,6-trimethylphenyl)-imino-2-ethyl)-pyrazine], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-imino-2-ethyl)-pyrazine], -   [2-(N-(2,6-dimethylphenyl)-iminomethyl)-pyrimidine], -   [2-(N-(2-iso-propyl-6-methylphenyl)-iminomethyl)-pyrimidine], -   [2-(N-(2,5-di-tert-butylphenyl)-1-iminomethyl)-pyrimidine], -   [2-(N-(2,6-di-iso-propylphenyl)-1-iminomethyl)-pyrimidine], -   [2-(N-(2,6-diethylphenyl)-iminomethyl)-pyrimidine], -   [2-(N-(2,4,6-trimethylphenyl)-iminomethyl)-pyrimidine], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-iminomethyl)-pyrimidine], -   [2-(N-(2,6-dimethylphenyl)-imino-2-ethyl)-pyrimidine], -   [2-(N-(2-iso-propyl-6-methylphenyl)-imino-2-ethyl)-pyrimidine], -   [2-(N-(2,5-di-tert-butylphenyl)-1-imino-2-ethyl)-pyrimidine], and -   [2-(N-(2,6-di-iso-propylphenyl)-1-imino-2-ethyl)-pyrimidine].

A second method of preparation uses a metal halide, a bidentate or tridentate chelating ligand, and a salt of a 1,2-catecholate complex, such as a dithallium 1,2-catecholate, to from the complex of the invention. An example of this reaction is illustrated below:

Metal halides that may be used include nickel (II) chloride, nickel (II) bromide, nickel (II) iodide, nickel (II) bromide ethylene glycol dimethyl ether complex, nickel (II) bromide 2-methoxyethylether complex, nickel (II) fluoride, bis(triphenylphosphine)nickel(II) bromide, bis(triphenylphosphine)nickel(II) chloride, dichlorobis(triethylphosphine)nickel, dibromo(carbonyl)bis(triethylphosphine)nickel, dibromo(1,2,3,4,5,6,7,8,9,10,11,12-dodecahydrocyclobuta[1,2:3,4]dicyclooctanenickel, chlorobis(trimethylphosphine)tricarbonylnickel, cobalt (II) chloride, cobalt (II) bromide, cobalt (II) iodide, cobalt (II) fluoride, dibromotetrakis(methyl isocyanide)cobalt, diiodotetrakis(methyl isocyanide)cobalt, bromotricarbonyl(triethylphosphine)cobalt, chlorotricarbonyl(triethylphosphine)cobalt, carbonylchlorotris(trimethylphosphine)cobalt, carbonyliodotris(trimethylphosphine)cobalt, tricarbonyliodo(triphenylphosphine)cobalt, dibromotetrakis(phenyl isocyanide)cobalt, diiodotetrakis(phenyl isocyanide)cobalt, dicarbonylchlorobis(triphenylphosphine)cobalt, dicarbonyliodobis(triphenylphosphine)cobalt, chlorotris(triphenylphosphine)cobalt, iron (II) bromide, iron (II) chloride, iron (II) fluoride, iron (II) iodide, bromotrinitrosyliron, dicarbonyldichloroiron, dibromotetracarbonyliron, dichlorotetracarbonyliron, diiodotetracarbonyliron, bis(tricarbonyliron bromide), bis(tricarbonyliron iodide), dicarbonyldiiodobis(methyl isocyanide)iron, tricarbonyldiiodo(trimethylphosphine)iron, dichlorobis(trimethylphosphine)iron, dichlorodicarbonylbis(trimethylphosphine)iron, diiododicarbonylbis(trimethylphosphine)iron, copper (I) bromide, copper (II) bromide, copper (I) chloride, copper (II) chloride, copper (II) fluoride, copper(I) iodide, dichloro-μ-1,4-butadienedicopper, iodo(triethyl phosphite-P)copper, chlorotricarbonyl[(1,2,5,6-η)-1,5-cyclooctadiene]copper, dichlorobis(acetonitrile)palladium (II), dichlorobis(benzonitrile)palladium(II), dichlorobis(tricyclohexylphosphine)palladium (II), dichlorobis(triphenylphosphine)palladium (II), dichlorobis(tri-o-tolylphosphine)palladium (II), dichloro(1,5-cyclooctadiene)palladium (II), dichlorodiamine palladium (II), palladium (II) bromide, palladium (II) chloride, palladium (II) iodide, dicarbonyldichloropalladium, dichlorobis(ethylene)palladium, dichloro[(1,2,5,6-η)-1,5-hexadiene]palladium, dibromo(norbornadiene)palladium, dichloro(norbornadiene)palladium, cyclooctatetraenepalladium dichloride, (1,5-cyclooctadiene)dibromopalladium, (1,5-cyclooctadiene)dichloropalladium, dichloro(dicyclopentadiene)palladium, (pentamethylcyclopentadiene)dichloropalladium, bis(tert-butylisocyanide)diiodopalladium, dichloro[hexamethyl(dewar benzene)]palladium, bis(benzonitrile)palladium dichloride, dichlorobis(phenyl isocyanide)palladium, dichlorobis(cyclohexylisocyanide)palladium, dichloro(phenylisocyanide)(triphenylarsine)palladium, dichloro(phenylisocyanide)(triphenylphosphine)palladium, dibromo(1,5-cyclooctadiene)platinum (II), dichlorobis(benzonitrile)platinum (II), dichlorobis(diethylsulfide)platinum (II), dichlorobis(pyridine)platinum (II), dichlorobis(triethylphosphine)platinum (II), dichlorobis(triphenylphosphine)platinum (II), dichloro(1,5-cyclooctadiene)platinum (II), dichlorodiamine platinum (II), di-μ-chloro-dichlorobis(ethylene)diplatinum (II), dichloro(dicyclopentadienyl)platinum (II), diiodo(1,5-cyclooctadiene)platinum (II), platinum (II) bromide, platinum (II) chloride, platinum (II) iodide, dibromodicarbonylplatinum, dicarbonyldichloroplatinum, dicarbonyldiiodoplatinum, bis(acetonitrile)dichloroplatinum, dichlorobis(ethylene)platinum, dichloro(ethylene)(dimethylamine)platinum, dichloro[(1,2,5,6-η)-1,5-hexadiene]platinum, dibromo(2,5-norbornadiene)platinum, dichloro(2,5-norbornadiene)platinum, diiodo(2,5-norbornadiene)platinum, dichloro(ethylene)(pyridine)platinum, dichlorocarbonyl(triethylphosphine)platinum, cyclooctatetraeneplatinum dichloride, cyclooctatetraeneplatinum dibromide, cyclooctatetraeneplatinum diiodide, diiodo(1,5-cyclooctadiene)platinum, dichloro(methylisocyanide)(triethylphosphine)platinum, carbonyldichloro(dimethylphenylphosphine)platinum, dibromo(dicyclopentadienyl)platinum, (pentamethylcyclopentadiene)dichloroplatinum, dibromo(hexamethyldewar benzene)platinum, dichloro(hexamethyldewar benzene)platinum, diiodo(hexamethyldewar benzene)platinum, dichloro(phenylisocyanide)(triethylphosphine)platinum, bis(benzonitrile)dichloroplatinum, carbonyldichloro(tricyclohexylphosphine)platinum, dichloro(methyl isocyanide)(triphenylphosphine)platinum, dichloro(ethylene)(triphenylphosphine)platinum, dichlorobis(tributylphosphine)platinum, dichloro(phenyl isocyanide)(triphenylphosphine)platinum, silver (I) chloride, silver (I) bromide, silver (I) iodide, silver (I) fluoride, silver (II) fluoride, chlorocarbonyl gold (I), chlorotriethylphosphine gold (I), chlorotrimethylphosphine gold (I), chlorotriphenylphosphine gold (I), gold (I) chloride, gold (I) iodide, chlorotricyclohexylphosphine gold, chlorocyclooctene gold, dichloro(benzene)ruthenium (II) dimer, dichloro(1,5-cyclooctadiene)ruthenium (II), dichlorodicarbonylbis(triphenylphosphine)ruthenium (II), dichlorotricarbonylruthenium (II) dimer, dichlorotris(triphenylphosphine)ruthenium (II), chlorotris(triphenylphosphine)ruthenium, dichlorotris(triphenylphosphine)osmium, rhenium pentacarbonyl bromide, rhenium pentacarbonyl chloride, chlorocarbonylbis(triphenylphosphine)iridium (I), chloro-1,5-cyclooctadiene iridium (I) dimer, chlorotricarbonyliridium (I), and the like. Pseudo metal halides such as metal triflates may be used in place of the metal halide.

Most preferred metal halides are nickel (II) chloride, nickel (II) bromide, nickel (II) bromide ethylene glycol dimethyl ether complex, nickel (II) bromide 2-methoxyethylether complex, cobalt (II) chloride, cobalt (II) bromide, bromotricarbonyl(triethylphosphine)cobalt, chlorotricarbonyl(triethylphosphine)cobalt, carbonylchlorotris(trimethylphosphine)cobalt, iron (II) bromide, iron (II) chloride, bromotrinitrosyliron, dicarbonyldichloroiron, dibromotetracarbonyliron, dichlorotetracarbonyliron, copper (I) bromide, copper (II) bromide, copper (I) chloride, copper (II) chloride, dichloro-μ-1,4-butadienedicopper, chlorotricarbonyl[(1,2,5,6-η)-1,5-cyclooctadiene]copper, dichloro(1,5-cyclooctadiene)palladium (II), dichlorodiamine palladium (II), palladium (II) bromide, palladium (II) chloride, dicarbonyldichloropalladium, dichlorobis(ethylene)palladium, dibromo(norbornadiene)palladium, dichloro(norbornadiene)palladium, cyclooctatetraenepalladium dichloride, (1,5-cyclooctadiene)dibromopalladium, (1,5-cyclooctadiene)dichloropalladium, dichloro(dicyclopentadiene)palladium, dibromo(1,5-cyclooctadiene)platinum (II), dichlorobis(pyridine)platinum (II), dichloro(1,5-cyclooctadiene)platinum (II), dichlorodiamine platinum (II), di-μ-chloro-dichlorobis(ethylene)diplatinum (II), dichloro(dicyclopentadienyl)platinum (II), platinum (II) bromide, platinum (II) chloride, dibromodicarbonylplatinum, dicarbonyldichloroplatinum, dichlorobis(ethylene)platinum, dichloro(ethylene)(dimethylamine)platinum, dibromo(2,5-norbornadiene)platinum, dichloro(2,5-norbornadiene)platinum, silver (I) chloride, silver (I) bromide, chlorocarbonyl gold (I), chlorotrimethylphosphine gold (I), gold (I) chloride, chlorocyclooctene gold, dichloro(benzene)ruthenium (II) dimer, dichloro(1,5-cyclooctadiene)ruthenium (II), dichlorotricarbonylruthenium (II) dimer, dichlorotris(triphenylphosphine)osmium, rhenium pentacarbonyl bromide, rhenium pentacarbonyl chloride, chloro-1,5-cyclooctadiene iridium (I) dimer, chlorotricarbonyliridium (I), and the like.

Even more preferred are nickel (II) chloride, nickel (II) bromide, nickel (II) bromide ethylene glycol dimethyl ether complex, nickel (II) bromide 2-methoxyethylether complex, cobalt (II) chloride, cobalt (II) bromide, iron (II) bromide, iron (II) chloride.

Catecholate salts that may be used include dithallium catecholate, Group 1 catecholate salts such as a disodium catecholate or a dipotassium catecholate, and Group 2 catecholate salts such as magnesium catecholate. Grignard type reagents such as di(magnesiumbromide)catecholate, may also be used. Preferred catecholate salts include the salts of 3,6-di-tert-butylcatecholate, 3,6-di-tert-butyl-4-chlorocatecholate, 3,6-di-tert-butyl-4,5-dichlorocatecholate, 3,6-di-tert-butyl-4-bromocatecholate, 3,6-di-tert-butyl-4,5-dibromocatecholate, 3,6-di-tert-butyl-4-fluorocatecholate, 3,6-di-tert-butyl-4,5-difluorocatecholate, 3,6-di-tert-butyl-4-methoxycatecholate, 3,6-di-tert-butyl-4,5-dimethoxycatecholate, 3,6-di-tert-butyl-4-ethoxycatecholate, 3,6-di-tert-butyl-4,5-diethoxycatecholate, 3,6-di-tert-butyl-4-propoxycatecholate, 3,6-di-tert-butyl-4,5-dipropoxycatecholate, 3,6-di-tert-butyl-4-butoxycatecholate, 3,6-di-tert-butyl-4,5-dibutoxycatecholate, 3,6-di-tert-butyl-4-iso-propylcatecholate, 3,6-di-tert-butyl-4,5-di-iso-propylcatecholate, 3,6-di-tert-butyl-4-cyclohexylcatecholate, 3,5-di-tert-butylcatecholate, 3,5-di-tert-butyl-6-chlorocatecholate, 3,5-di-tert-butyl-6-bromocatecholate, 3,5-di-tert-butyl-6-fluorocatecholate, 3,5-di-tert-butyl-6-nitrocatecholate, 3,4,6-tri-iso-propylcatecholate, 3,4,5,6-tetra-iso-propylcatecholate, 3,6-di-iso-propylcatecholate, 1,4,6,8-tetra-tert-butyldibenzo[1,4]dioxine-2,3-diolate, 1,4,6,7,8,9-hexachlorodibenzo[1,4]dioxine-2,3-diolate, 1,4,6,7,8,9-hexabromodibenzo[1,4]dioxine-2,3-diolate, 3,6-di-n-butylcatecholate, 3,6-di-n-butyl-4-chlorocatecholate, 3,6-di-n-butyl-4,5-dichlorocatecholate,3,6-di-n-butyl-4-bromocatecholate, 3,6-di-n-butyl-4,5-dibromocatecholate, 3,6-di-n-butyl-4-fluorocatecholate,3,6-di-n-butyl-4,5-difluorocatecholate, 3,6-di-n-butyl-4-methoxycatecholate,3,6-di-n-butyl-4,5-dimethoxycatecholate, 3,6-di-n-butyl4-ethoxycatecholate, 3,6-di-n-butyl-4,5-diethoxycatecholate, 3,6-di-n-butyl-4-propoxycatecholate, 3,6-di-n-butyl-4,5-dipropoxycatecholate, 3,6-di-n-butyl-4-butoxycatecholate, 3,6-di-n-butyl-4,5-dibutoxycatecholate, 3,6-di-n-butyl-4-iso-propylcatecholate, 3,6-di-n-butyl-4,5-di-iso-propylcatecholate, 3,6-di-n-butyl-4-cyclohexylcatecholate, 3,5-di-n-butylcatecholate, 3,5-di-n-butyl-6-chlorocatecholate, 3,5-di-n-butyl-6-bromocatecholate, 3,5-di-n-butyl-6-fluorocatecholate, 3,5-di-n-butyl-6-nitrocatecholate, 3,6-di-iso-butylcatecholate, 3,6-di-iso-butyl-4-chlorocatecholate, 3,6-di-iso-butyl-4,5-dichlorocatecholate,3,6-di-iso-butyl-4-bromocatecholate, 3,6-di-iso-butyl-4,5-dibromocatecholate, 3,6-di-iso-butyl-4-fluorocatecholate, 3,6-di-iso-butyl-4,5-difluorocatecholate, 3,6-di-iso-butyl-4-methoxycatecholate, 3,6-di-iso-butyl-4,5-dimethoxycatecholate, 3,6-di-iso-butyl-4-ethoxycatecholate, 3,6-di-iso-butyl-4,5-diethoxycatecholate, 3,6-di-iso-butyl-4-propoxycatecholate, 3,6-di-iso-butyl-4,5-dipropoxycatecholate, 3,6-di-iso-butyl-4-butoxycatecholate, 3,6-di-iso-butyl-4,5-dibutoxycatecholate, 3,6-di-iso-butyl-4-iso-propylcatecholate, 3,6-di-iso-butyl-4,5-di-iso-propylcatecholate, 3,6-di-iso-butyl-4-cyclohexylcatecholate, 3,5-di-iso-butylcatecholate, 3,5-di-iso-butyl-6-chlorocatecholate, 3,5-di-iso-butyl-6-bromocatecholate, 3,5-di-iso-butyl-6-fluorocatecholate, 3,5-di-iso-butyl-6-nitrocatecholate, 3,4,6-tri-n-propylcatecholate, 3,6-di-iso-propyl-4-chlorocatecholate, 3,6-di-iso-propyl-4,5-dichlorocatecholate, 3,6-di-iso-propyl-4-bromocatecholate, 3,6-di-iso-propyl-4,5-dibromocatecholate, 3,6-di-iso-propyl-4-fluorocatecholate, 3,6-di-iso-propyl-4,5-difluorocatecholate, 3,6-di-iso-propyl-4-methyoxycatecholate, 3,6-di-iso-propyl-4,5-dimethoxycatecholate, 3,6-di-iso-propyl-4-ethyoxycatecholate, 3,6-di-iso-propyl-4,5-diethoxycatecholate, 3,6-di-iso-propyl-4-propoxycatecholate, 3,6-di-iso-propyl-4,5-dipropoxycatecholate, 3,6-di-iso-propyl-4-butoxycatecholate, 3,6-di-iso-propyl-4,5-dibutoxycatecholate, 3,6-di-iso-propyl-4-cyclohexylcatecholate, 3,6-dimethyl-4-chlorocatecholate, 3,6-dimethyl-4,5-dichlorocatecholate, 3,6-diiso-propyl-4-bromocatecholate, 3,6-dimethyl-4,5-dibromocatecholate, 3,6-dimethyl-4-fluorocatecholate, 3,6-dimethyl-4,5-difluorocatecholate, 3,6-dimethyl-4-methyoxycatecholate, 3,6-dimethyl-4,5-dimethoxycatecholate, 3,6-dimethyl-4-ethyoxycatecholate, 3,6-dimethyl-4,5-diethoxycatecholate, 3,6-dimethyl-4-propoxycatecholate, 3,6-dimethyl-4,5-dipropoxycatecholate, 3,6-dimethyl-4-butoxycatecholate, 3,6-dimethyl-4,5-dibutoxycatecholate, 3,5-di-iso-propylcatecholate, 3,6-di-n-propylcatecholate, 3,5-di-n-propylcatecholate, 3,6-dimethylcatecholate, 3,5-dimethylcatecholate, naphthalene-2,3-diolate, phenanthrene-9,10-diolate, 3,4,5,6-tetrachlorocatecholate, 3,6-dichlorocatecholate, and 4-methylcatecholate.

Preferred bidentate and tridentate chelating ligands are the same as those described above for the first method of preparation.

The third method of preparation requires the use of the bidentate or tridentate chelated metal halide with a salt of a 1,2-catecholate complex, such as a dithallium 1,2-catecholate, to from the complex of the invention. This reaction is illustrated below:

Preferred catecholate salts are the same as those listed above for the second method of preparation. Preferred bidentate or tridentate chelated metal halides are the nickel dihalides, palladium dihalides, cobalt dihalides, cobalt halides, iron dihalides, copper halides, copper dihalides, platinum dihalides, silver halides, silver dihalides, ruthenium dihalides, rhenium halides, osmium dihalides and iridium halides of the bidentate and tridentate chelating ligands listed above for the first method of preparation. For example, the metal halides of the bidentate chelating ligand, [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene], would include:

-   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel     dichloride, -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]palladium     dichloride, -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]cobalt     dichloride, -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]cobalt     chloride, -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]iron     dichloride, -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]copper     chloride, -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]copper     dichloride, -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]platinum     dichloride, -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]silver     chloride, -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]silver     dichloride, -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]ruthenium     dichloride, -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]rhenium     chloride, -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]osmium     dichloride, -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]iridium     chloride, and similar compounds where “chloride” can be replaced     with bromide, fluoride, and iodide. Most preferred bidentate or     tridentate chelated metal halides are the nickel dihalides,     palladium dihalides, cobalt dihalides, cobalt halides, and iron     dihalides.

The following compounds have been synthesized by one or more of the above methods:

Mixed Catalysts

Mixed catalyst systems can also be used, for example, the invention catalyst can be used in conjunction with a second catalyst in the same reactor or in a series of reactors where the invention catalyst produces ethylene oligomers, macromers, or polymers with olefinic end-groups, and the second catalyst incorporates these oligomers, macromers, or polymers into a polymer backbone as a copolymer with other monomers, such as ethylene, propylene, butene, and other C2 to C20 olefins. Likewise, the invention catalyst can be used in conjunction with a second catalyst in the same reactor or in a series of reactors where the invention catalyst and the other catalyst produces mixtures or blends of polymers.

Invention polymerization catalyst systems can comprise additional olefin polymerization catalysts. These additional olefin polymerization catalysts are any of those well known in the art to catalyze the olefin to polyolefin reaction. Some invention catalysts systems include Group-4-6 metallocenes as additional olefin polymerization catalysts. Metallocenes include (un)bridged compounds containing one (mono(cyclopentadienyl)metallocenes) or two (bis(cyclopentadienyl)metallocenes) (un)substituted cyclopentadienyl ligand(s). In bridged metallocenes, a single, cyclopentadienyl ligand connects to a heteroatom ligand with both coordinating to the metal center, or two cyclopentadienyl ligands connect together with both cyclopentadienyl ligands coordinating to the metal center. Typical catalysts and their precursors are well known in the art. Suitable description appears in the patent literature, for example U. S. Pat. Nos. 4,871,705, 4,937,299, 5,324,800, EP-A-0418044, EP-A-0591756, WO-A-92/00333 and WO-A-94/01471. Some embodiments select the metallocene compounds from mono- or bis-cyclopentadienyl-substituted, Group-4, -5, and -6 metals in which cyclopentadienyls are (un)substituted with one or more groups or are bridged to each other or to a metal-coordinated heteroatom. Some embodiments select similar metallocene compounds except they are not necessarily bridged to each other or to a metal-coordinated heteroatom. See U.S. Pat. Nos. 5,278,264 and 5,304,614.

Some invention catalysts systems include the following additional olefin polymerization catalysts. Metallocene compounds suitable for linear polyethylene or ethylene-containing copolymer production (where copolymer means comprising at least two different monomers) are essentially those disclosed in WO-A-92/00333, WO 97/44370 and U.S. Pat. Nos. 5,001,205, 5,057,475, 5,198,401, 5,304,614, 5,308,816 and 5,324,800. Selection of metallocene compounds for isotactic or syndiotactic polypropylene blend production, and their syntheses, are well-known in the patent and academic literature, e.g. Journal of Organometallic Chemistry 369, 359-370 (1989). Typically, those catalysts are stereorigid, asymmetric, chiral, or bridged-chiral metallocenes. Invention activators are suited for activating these types of catalyst precursors.

Likewise, some invention catalysts systems include the following additional olefin polymerization catalysts: monocyclopentadienyl metallocenes with Group-15 or -16 heteroatoms connected, through a bridging group, to a cyclopentadienyl-ligand ring carbon. Both the cyclopentadienyl Cp-ligand and the heteroatom connect to a transition metal. Some embodiments select a Group-4 transition metal. Additionally, unbridged monocyclopentadienyl, heteroatom-containing Group-4 components of WO 97/22639 will function with this invention. Moreover, transition metal systems with high-oxidation-state, Group-5-10 transition-metal centers are known and can serve as the additional olefin polymerization catalysts with invention catalyst systems.

Invention catalyst systems can use non-cyclopentadienyl, Group-4-5 precursor compounds as the additional olefin polymerization catalysts. Non-cyclopentadienyl, Group-4-5 precursor compounds are activable to stable, discrete cationic complexes include those containing bulky, chelating, diamide ligands, such as described in U. S. Pat. No. 5,318,935 and “Conformationally Rigid Diamide Complexes: Synthesis and Structure of Tantalum (III) Alkyne Derivatives”, D. H. McConville, et al, Organometallics 1995, 14, 3154-3156. U.S. Pat. No. 5,318,935 describes bridged and unbridged, bis-amido catalyst compounds of Group-4 metals capable of α:-olefins polymerization. Bridged bis(arylamido) Group-4 compounds for olefin polymerization are described by D. H. McConville, et al., in Organometallics 1995, 14, 5478-5480. Synthetic methods and compound characterization are presented. Further work appearing in D. H. McConville, et al, Macromolecules 1996, 29, 5241-5243, describes bridged bis(arylamido) Group-4 compounds that are polymerization catalysts for 1-hexene. Additional invention-suitable transition-metal compounds include those described in WO 96/40805. Cationic Group-3- or Lanthanide olefin polymerization complexes are disclosed in copending U.S. application Ser. No. 09/408050, filed 29 Sep. 1999, and its equivalent PCT/US99/22690. A monoanionic bidentate ligand and two monoanionic ligands stabilize those catalyst precursors; they are activable with this invention” ionic cocatalysts. Other suitable Group-4-5 non-metallocene catalysts are bimetallocyclic catalyst compounds comprising two independently selected Group-4-5 metal atoms directly linked through two bridging groups to form cyclic compounds.

Invention catalyst systems can use other transition metal catalyst precursors that have a 2+ oxidation state as the additional olefin polymerization catalyst. Typical Ni²⁺ and Pd²⁺ complexes are diimines, see “New Pd(II)- and Ni(II)-Based Catalysts for Polymerization of Ethylene and α-Olefins”, M. Brookhart, et al, J. Am. Chem. Soc., 1995, 117, 6414-6415, WO 96/23010 and WO 97/02298. See additionally the related bis(imino) Group-8 and -9 organometallic compounds described by V. C. Gibson and others in “Novel olefin polymerization catalysts based on iron and cobalt”, Chem. Commun., 849-850, 1998.

For a review of other potential catalysts used in combination or series with the invention catalysts, see S. D. Ittel and L. K. Johnson, Chem. Rev. 2000, 1000, 1169 and V. C. Gibson and S. K. Spitzmesser, Chem. Rev. 2003, 103, 283.

Activators and Catalyst Activation

The catalyst precursors, when activated by a commonly known activator such as methyl alumoxane, form active catalysts for the polymerization or oligomerization of olefins. Activators that may be used include alumoxanes such as methyl alumoxane, modified methyl alumoxane, ethyl alumoxane, iso-butyl alumoxane and the like; Lewis acid activators preferably used in combination with a co-activator include triphenyl boron, tris-perfluorophenyl boron, tris-perfluorophenyl aluminum and the like; Ionic activators preferably used in combination with a co-activator include dimethylanilinium tetrakis perfluorophenyl borate, triphenyl carbonium tetrakis perfluorophenyl borate, dimethylanilinium tetrakis perfluorophenyl aluminate, and the like.

A co-activator is a compound capable of alkylating the transition metal complex, such that when used in combination with an activator, an active catalyst is formed. Co-activators include alumoxanes such as methyl alumoxane, modified alumoxanes such as modified methyl alumoxane, and trimethyl aluminum.

The alumoxane component useful as an activator typically is an oligomeric aluminum compound represented by the general formula (R^(x)—Al—O)_(n), which is a cyclic compound, or R^(x)(R^(x)—Al—O)_(n)AlR^(x) ₂, which is a linear compound. In the general alumoxane formula, R^(x) is independently a C₁-C₂₀ alkyl radical, for example, methyl, ethyl, propyl, butyl, pentyl, isomers thereof, and the like, and “n” is an integer from 1-50. Most preferably, R^(x) is methyl and “n” is at least 4. Methyl alumoxane and modified methyl alumoxanes are most preferred. For further descriptions see, EP 0 279 586, EP 0 594 218, EP 0 561 476, WO94/10180 and U.S. Pat. Nos. 4,665,208, 4,874,734, 4,908,463, 4,924,018, 4,952,540, 4,968,827, 5,041,584, 5,091,352, 5,103,031, 5,157,137, 5,204,419, 5,206,199, 5,235,081, 5,248,801, 5,329,032, 5,391,793, and 5,416,229.

When an alumoxane or modified alumoxane is used, the catalyst-precursor-to-activator molar ratio is from about 1:1000 to 10:1; alternatively, 1:500 to 1:1; alternatively 1:300 to 1:1; alternatively 1:200 to 1:1; alternatively 1:100 to 1:1; alternatively 1:50 to 1:1; alternatively 1:10 to 1:1. When the activator is an alumoxane (modified or unmodified), some embodiments select the maximum amount of activator at a 5000-fold molar excess over the catalyst precursor (per metal catalytic site). The preferred minimum activator-to-catalyst-precursor ratio is 1:1 molar ratio.

Ionic activators used in combination with a co-activator may be used in the practice of this invention. Preferably, discrete ionic activators such as [Me₂PhNH][B(C₆F₅)₄], [Ph₃C][B(C₆F₅)₄), [Me₂PhNH][B((C₆H₃-3,5-(CF₃)₂))₄], [Ph₃C][B((C₆H₃-3,5-(CF₃)₂))₄], [Bu₃NH][BF₄], [NH₄][PF₆], [NH₄][SbF₆], [NH₄][AsF₆], [NH₄][B(C₆H₅)₄] or Lewis acidic activators such as B(C₆F₅)₃ or B(C₆H₅)₃ can be used. Preferred co-activators are alumoxanes such as methyl alumoxane, modified alumoxanes such as modified methyl alumoxane, and the trialkyl aluminum, trimethyl aluminum.

It is within the scope of this invention to use an ionizing or stoichiometric activator, neutral or ionic, such as tri(n-butyl)ammonium tetrakis(pentafluorophenyl)borate, a trisperfluorophenyl boron metalloid precursor or a trisperfluoronaphthyl boron metalloid precursor, polyhalogenated heteroborane anions (WO 98/43983), boric acid (U.S. Pat. No. 5,942,459) or combination thereof. When such activators are used, they are used in combination with a co-activator such as an alumoxane, modified alumoxane and/or trimethylaluminum.

Examples of neutral stoichiometric activators include tri-substituted boron, tellurium, aluminum, gallium and indium or mixtures thereof. The three substituent groups are each independently selected from alkyls, alkenyls, halogen, substituted alkyls, aryls, arylhalides, alkoxy and halides. Preferably, the three groups are independently selected from halogen, mono or multicyclic (including halosubstituted) aryls, alkyls, and alkenyl compounds and mixtures thereof, preferred are alkenyl groups having 1 to 20 carbon atoms, alkyl groups having 1 to 20 carbon atoms, alkoxy groups having 1 to 20 carbon atoms and aryl groups having 3 to 20 carbon atoms (including substituted aryls). More preferably, the three groups are alkyls having 1 to 4 carbon groups, phenyl, naphthyl or mixtures thereof. Even more preferably, the three groups are halogenated, preferably fluorinated, aryl groups. Most preferably, the neutral stoichiometric activator is trisperfluorophenyl boron or trisperfluoronaphthyl boron.

Ionic stoichiometric activator compounds may contain an active proton, or some other cation associated with, but not coordinated to, or only loosely coordinated to, the remaining ion of the ionizing compound. Such compounds and the like are described in European publications EP-A-0 570 982, EP-A-0 520 732, EP-A-0 495 375, EP-B1-0 500 944, EP-A-0 277 003 and EP-A-0 277 004, and U.S. Pat. Nos. 5,153,157, 5,198,401, 5,066,741, 5,206,197, 5,241,025, 5,384,299 and 5,502,124 and U.S. patent application Ser. No. 08/285,380, filed Aug. 3, 1994, all of which are herein fully incorporated by reference.

Ionic catalysts can be prepared by reacting a transition metal compound with a co-activator that alkylates the transition metal compound, and some neutral Lewis acids, such as B(C₆F₆)₃, which upon reaction with the hydrolyzable ligand (X′) of the alkylated transition metal compound forms an anion, such as ([B(C₆F₅)₃(X′)]⁻), which stabilizes the cationic transition metal species generated by the reaction. The catalysts can be, and preferably are, prepared with activator components which are ionic compounds or compositions. However preparation of activators utilizing neutral compounds is also contemplated by this invention.

Compounds useful as an activator component in the preparation of the ionic catalyst systems used in the process of this invention comprise a cation, which is preferably a Bronsted acid capable of donating a proton, and a compatible non-coordinating anion which anion is relatively large (bulky), capable of stabilizing the active catalyst species which is formed when the two compounds are combined and said anion will be sufficiently labile to be displaced by olefinic diolefinic and acetylenically unsaturated substrates or other neutral Lewis bases such as ethers, nitriles and the like. Two classes of compatible non-coordinating anions have been disclosed in EPA 277,003 and EPA 277,004 published 1988: 1) anionic coordination complexes comprising a plurality of lipophilic radicals covalently coordinated to and shielding a central charge-bearing metal or metalloid core, and 2) anions comprising a plurality of boron atoms such as carboranes, metallacarboranes and boranes.

In a preferred embodiment, the stoichiometric activators include a cation and an anion component, and may be represented by the following formula: (L**-H)_(d) ⁺(A^(d−))

-   wherein L** is an neutral Lewis base; -   H is hydrogen; -   (L* *-H)⁺ is a Bronsted acid -   A^(d−) is a non-coordinating anion having the charge d− -   d is an integer from 1 to 3.     The cation component, (L**-H)_(d) ⁺ may include Bronsted acids such     as protons or protonated Lewis bases or reducible Lewis acids     capable of protonating or abstracting a moiety, such as an alkyl or     aryl, from the precatalyst after alkylation.

The activating cation (L**-H)_(d) ⁺ may be a Bronsted acid, capable of donating a proton to the alkylated transition metal catalytic precursor resulting in a transition metal cation, including ammoniums, oxoniums, phosphoniums, silyliums, and mixtures thereof, preferably ammoniums of methylamine, aniline, dimethylamine, diethylamine, N-methylaniline, diphenylamine, trimethylamine, triethylamine, N,N-dimethylaniline, methyldiphenylamine, pyridine, p-bromo N,N-dimethylaniline, p-nitro-N,N-dimethylaniline, phosphoniums from triethylphosphine, triphenylphosphine, and diphenylphosphine, oxomiuns from ethers such as dimethyl ether, diethyl ether, tetrahydrofuran and dioxane, sulfoniums from thioethers, such as diethyl thioethers and tetrahydrothiophene, and mixtures thereof. The activating cation (L**-H)_(d) ⁺ may also be a moiety such as silver, tropylium, carbeniums, ferroceniums and mixtures, preferably carboniums and ferroceniums; most preferably triphenyl carbonium.

The anion component A^(d−) include those having the formula [M^(k+)Q_(n)]^(d−) wherein k is an integer from 1 to 3; n is an integer from 2-6; n-k=d; M is an element selected from Group 13 of the Periodic Table of the Elements, preferably boron or aluminum, and Q is independently a hydride, bridged or unbridged dialkylamido, halide, alkoxide, aryloxide, hydrocarbyl, substituted hydrocarbyl, halocarbyl, substituted halocarbyl, and halosubstituted-hydrocarbyl radicals, said Q having up to 20 carbon atoms with the proviso that in not more than one occurrence is Q a halide. Preferably, each Q is a fluorinated hydrocarbyl group having 1 to 20 carbon atoms, more preferably each Q is a fluorinated aryl group, and most preferably each Q is a pentafluoryl aryl group. Examples of suitable A^(d−) also include diboron compounds as disclosed in U.S. Pat. No. 5,447,895, which is fully incorporated herein by reference.

Illustrative, but not limiting examples of boron compounds which may be used as an activating cocatalyst in combination with a co-activator in the preparation of the improved catalysts of this invention are tri-substituted ammonium salts such as: trimethylammonium tetraphenylborate, triethylammonium tetraphenylborate, tripropylammonium tetraphenylborate, tri(n-butyl)ammonium tetraphenylborate, tri(tert-butyl)ammonium tetraphenylborate, N,N-dimethylanilinium tetraphenylborate, N,N-diethylanilinium tetraphenylborate, N,N-dimethyl-(2,4,6-trimethylanilinium)tetraphenylborate, trimethylammonium tetrakis(pentafluorophenyl)borate, triethylammonium tetrakis(pentafluorophenyl)borate, tripropylammonium tetrakis(pentafluorophenyl)borate, tri(n-butyl)ammonium tetrakis(pentafluorophenyl)borate, tri(sec-butyl)ammonium tetrakis(pentafluorophenyl)borate, N,N-dimethylanilinium tetrakis(pentafluorophenyl)borate, N,N-diethylanilinium tetrakis(pentafluorophenyl)borate, N,N-dimethyl-(2,4,6-trimethylanilinium)tetrakis(pentafluorophenyl)borate, trimethylammonium tetrakis-(2,3,4,6-tetrafluorophenyl)borate, triethylammonium tetrakis-(2,3,4,6-tetrafluorophenyl)borate, tripropylammonium tetrakis-(2,3,4,6-tetrafluorophenyl)borate, tri(n-butyl)ammonium tetrakis-(2,3,4,6-tetrafluorophenyl)borate, dimethyl(tert-butyl)ammonium tetrakis-(2,3,4,6-tetrafluorophenyl)borate, N,N-dimethylanilinium tetrakis-(2,3,4,6-tetrafluorophenyl)borate, N,N-diethylanilinium tetrakis-(2,3,4,6-tetrafluorophenyl)borate, N,N-dimethyl-(2,4,6-trimethylanilinium)tetrakis-(2,3,4,6-tetrafluorophenyl)borate, trimethylammonium tetrakis(perfluoronaphthyl)borate, triethylammonium tetrakis(perfluoronaphthyl)borate, tripropylammonium tetrakis(perfluoronaphthyl)borate, tri(n-butyl)ammonium tetrakis(perfluoronaphthyl)borate, tri(tert-butyl)ammonium tetrakis(perfluoronaphthyl)borate, N,N-dimethylanilinium tetrakis(perfluoronaphthyl)borate, N,N-diethylanilinium tetrakis(perfluoronaphthyl)borate, N,N-dimethyl-(2,4,6-trimethylanilinium)tetrakis(perfluoronaphthyl)borate, trimethylammonium tetrakis(perfluorobiphenyl)borate, triethylammonium tetrakis(perfluorobiphenyl)borate, tripropylammonium tetrakis(perfluorobiphenyl)borate, tri(n-butyl)ammonium tetrakis(perfluorobiphenyl)borate, tri(tert-butyl)ammonium tetrakis(perfluorobiphenyl)borate, N,N-dimethylanilinium tetrakis(perfluorobiphenyl)borate, N,N-diethylanilinium tetrakis(perfluorobiphenyl)borate, N,N-dimethyl-(2,4,6-trimethylanilinium)tetrakis(perfluorobiphenyl)borate, trimethylammonium tetrakis(3,5-bis(trifluoromethyl)phenyl)borate, triethylammonium tetrakis(3,5-bis(trifluoromethyl)phenyl)borate, tripropylammonium tetrakis(3,5-bis(trifluoromethyl)phenyl)borate, tri(n-butyl)ammonium tetrakis(3,5-bis(trifluoromethyl)phenyl)borate, tri(tert-butyl)ammonium tetrakis(3,5-bis(trifluoromethyl)phenyl)borate, N,N-dimethylanilinium tetrakis(3,5-bis(trifluoromethyl)phenyl)borate, N,N-diethylanilinium tetrakis(3,5-bis(trifluoromethyl)phenyl)borate, N,N-dimethyl-(2,4,6-trimethylanilinium)tetrakis(3,5-bis(trifluoromethyl)phenyl)borate, and dialkyl ammonium salts such as: di-(iso-propyl)ammonium tetrakis(pentafluorophenyl)borate, and dicyclohexylammonium tetrakis(pentafluorophenyl)borate; and other salts such as tri(o-tolyl)phosphonium tetrakis(pentafluorophenyl)borate, tri(2,6-dimethylphenyl)phosphonium tetrakis(pentafluorophenyl)borate, tropillium tetraphenylborate, triphenylcarbenium tetraphenylborate, triphenylphosphonium tetraphenylborate, triethylsilylium tetraphenylborate, benzene(diazonium)tetraphenylborate, tropillium tetrakis(pentafluorophenyl)borate, triphenylcarbenium tetrakis(pentafluorophenyl)borate, triphenylphosphonium tetrakis(pentafluorophenyl)borate, triethylsilylium tetrakis(pentafluorophenyl)borate, benzene(diazonium) tetrakis(pentafluorophenyl)borate, tropillium tetrakis-(2,3,4,6-tetrafluorophenyl)borate, triphenylcarbenium tetrakis-(2,3,4,6-tetrafluorophenyl)borate, triphenylphosphonium tetrakis-(2,3,4,6-tetrafluorophenyl)borate, triethylsilylium tetrakis-(2,3,4,6-tetrafluorophenyl)borate, benzene(diazonium) tetrakis-(2,3,4,6-tetrafluorophenyl)borate, tropillium tetrakis(perfluoronaphthyl)borate, triphenylcarbenium tetrakis(perfluoronaphthyl)borate, triphenylphosphonium tetrakis(perfluoronaphthyl)borate, triethylsilylium tetrakis(perfluoronaphthyl)borate, benzene(diazonium)tetrakis(perfluoronaphthyl)borate, tropillium tetrakis(perfluorobiphenyl)borate, triphenylcarbenium tetrakis(perfluorobiphenyl)borate, triphenylphosphonium tetrakis(perfluorobiphenyl)borate, triethylsilylium tetrakis(perfluorobiphenyl)borate, benzene(diazonium)tetrakis(perfluorobiphenyl)borate, tropillium tetrakis(3,5-bis(trifluoromethyl)phenyl)borate, triphenylcarbenium tetrakis(3,5-bis(trifluoromethyl)phenyl)borate, triphenylphosphonium tetrakis(3,5-bis(trifluoromethyl)phenyl)borate, triethylsilylium tetrakis(3,5-bis(trifluoromethyl)phenyl)borate, and benzene(diazonium) tetrakis(3,5-bis(trifluoromethyl)phenyl)borate.

Most preferably, the ionic stoichiometric activator (L**-H)^(d+)(A^(d−)) is N,N-dimethylanilinium tetrakis(perfluorophenyl)borate, N,N-dimethylanilinium tetrakis(perfluoronaphthyl)borate, N,N-dimethylanilinium tetrakis(perfluorobiphenyl)borate, N,N-dimethylanilinium tetrakis(3,5-bis(trifluoromethyl)phenyl)borate, triphenylcarbenium tetrakis(perfluoronaphthyl)borate, triphenylcarbenium tetrakis(perfluorobiphenyl)borate, triphenylcarbenium tetrakis(3,5-bis(trifluoromethyl)phenyl)borate, or triphenylcarbenium tetra(perfluorophenyl)borate.

Invention catalyst precursors can also be activated with cocatalysts or activators that comprise non-coordinating anions containing metalloid-free cyclopentadienide ions. These are described in U.S. patent Publication 2002/0058765 A1, published on 16 May 2002, and for the instant invention, require the addition of a co-activator to the catalyst pre-cursor.

The term “non-coordinating anion” (NCA) means an anion that does not coordinate to the catalyst metal cation or that does coordinate to the metal cation, but only weakly. An NCA coordinates weakly enough that a neutral Lewis base, such as an olefinically or acetylenically unsaturated monomer can displace it from the catalyst center. “Compatible” non-coordinating anions are those which are not degraded to neutrality when the initially formed complex decomposes. Further, the anion will not transfer an anionic substituent or fragment to the cation so as to cause it to form a neutral transition metal compound and a neutral by-product from the anion. Non-coordinating anions useful in accordance with this invention are those that are compatible, stabilize the transition metal complex cation in the sense of balancing its ionic charge at +1, yet retain sufficient lability to permit displacement by an ethylenically or acetylenically unsaturated monomer during polymerization. These types of cocatalysts sometimes use scavengers such as but not limited to tri-iso-butyl aluminum, tri-n-octyl aluminum, tri-n-hexyl aluminum, triethylaluminum or trimethylaluminum.

Invention process also can employ cocatalyst compounds or activator compounds that are initially neutral Lewis acids but form a cationic metal complex and a noncoordinating anion, or a zwitterionic complex upon reaction with the alkylated transition metal compounds. The alkylated invention compound is formed from the reaction of the catalyst pre-cursor and the co-activator. For example, tris(pentafluorophenyl) boron or aluminum act to abstract a hydrocarbyl ligand to yield an invention cationic transition metal complex and stabilizing noncoordinating anion, see EP-A-0 427 697 and EP-A-0 520 732 for illustrations of analogous Group-4 metallocene compounds. Also, see the methods and compounds of EP-A-0 495 375. For formation of zwitterionic complexes using analogous Group 4 compounds, see U.S. Pat. Nos. 5,624,878; 5,486,632; and 5,527,929.

Additional neutral Lewis-acids are known in the art and are suitable for abstracting formal anionic ligands. See in particular the review article by E. Y.-X. Chen and T. J. Marks, “Cocatalysts for Metal-Catalyzed Olefin Polymerization: Activators, Activation Processes, and Structure-Activity Relationships”, Chem. Rev., 100, 1391-1434 (2000).

When the cations of noncoordinating anion precursors are Bronsted acids such as protons or protonated Lewis bases (excluding water), or reducible Lewis acids such as ferrocenium or silver cations, or alkali or alkaline earth metal cations such as those of sodium, magnesium or lithium, the catalyst-precursor-to-activator molar ratio may be any ratio. Combinations of the described activator compounds may also be used for activation.

When an ionic or neutral stoichiometric activator is used, the catalyst-precursor-to-activator molar ratio is from 1:10 to 1:1; 1:10 to 10:1; 1:10 to 2:1; 1:10 to 3:1; 1:10 to 5:1; 1:2 to 1.2:1; 1:2 to 10:1; 1:2 to 2:1; 1:2 to 3:1; 1:2 to 5:1; 1:3 to 1.2:1; 1:3 to 10:1; 1:3 to 2:1; 1:3 to 3:1; 1:3 to 5:1; 1:5 to 1:1; 1:5 to 10:1; 1:5 to 2:1; 1:5 to 3:1; 1:5 to 5:1; 1:1 to 1:1.2. The catalyst-precursor-to-co-activator molar ratio is from 1:100 to 100:1; 1:75 to 75:1; 1:50 to 50:1; 1:25to25:1; 1:15 to 15:1; 1:10 to 10:1; 1:5to5:1, 1:2to2:1; 1:100 to 1:1; 1:75 to 1:1; 1:50 to 1:1; 1:25 to 1:1; 1:15 to 1:1; 1:10 to 1:1; 1:5 to 1:1; 1:2 to 1:1; 1:10 to 2:1.

Preferred activators and activator/co-activator combinations include methylalumoxane, modified methylalumoxane, mixtures of methylalumoxane with dimethylanilinium tetrakis(pentafluorophenyl)borate or tris(pentafluorophenyl)boron, and mixtures of trimethyl aluminum with dimethylanilinium tetrakis(pentafluorophenyl)borate or tris(pentafluorophenyl)boron

In some embodiments, scavenging compounds are used with stoichiometric activators. Typical aluminum or boron alkyl components useful as scavengers are represented by the general formula R^(x)JZ₂ where J is aluminum or boron, R^(x) is as previously defined above, and each Z is independently R^(x) or a different univalent anionic ligand such as halogen (Cl, Br, I), alkoxide (OR^(x)) and the like. Most preferred aluminum alkyls include triethylaluminum, diethylaluminum chloride, tri-iso-butylaluminum, tri-n-octylaluminum. tri-n-hexylaluminum, trimethylaluminum and the like. Preferred boron alkyls include triethylboron. Scavenging compounds may also be alumoxanes and modified alumoxanes including methylalumoxane and modified methylalumoxane.

Additionally, the active catalyst component can be formed in situ by mixing together the bidentate or tridentate chelating ligand, the metal carbonyl, and the 1,2-benzoquinone. This mixture is then added to the reactor and an activator is added, preferably in the presence of olefin. Other neutral metals or metal complexes may be used in place of the metal carbonyl, for example, in place of nickel carbonyl (Ni(CO)₄), bis(1,5-cyclooctadiene)nickel(0), bis(triphenylphosphine)nickel dicarbonyl, tetrakis(trifluorophosphine)nickel(0), nickel powder and the like; in place of cobalt carbonyl (Co₂(CO)₈), cobalt tricarbonyl nitrosyl, cobalt powder and the like; in place of iron carbonyl (Fe(CO)₅, Fe₃(CO)₁₂ or Fe₂(CO)₉), cyclohexadiene iron tricarbonyl, cyclooctatetrene iron tricarbonyl, or iron powder.

Supported Catalysts

The solubility of invention catalyst precursors allows for the ready preparation of supported catalysts. To prepare uniform supported catalysts, the catalyst precursor preferably dissolves in the chosen solvent. The term “uniform supported catalyst” means that the catalyst precursor, the activator and or the activated catalyst approach uniform distribution upon the support's accessible surface area, including the interior pore surfaces of porous supports. Some embodiments of supported catalysts prefer uniform supported catalysts; other embodiments show no such preference.

Invention supported catalyst systems may be prepared by any method effective to support other coordination catalyst systems, effective meaning that the catalyst so prepared can be used for oligomerizing or polymerizing olefin in a heterogenous process. The catalyst precursor, activator, co-activator if needed, suitable solvent, and support may be added in any order or simultaneously.

By one method, the activator, dissolved in an appropriate solvent such as toluene may be stirred with the support material for 1 minute to 10 hours. The total solution volume may be greater than the pore volume of the support, but some embodiments limit the total solution volume below that needed to form a gel or slurry (about 90% to 400%, preferably about 100-200% of the pore volume). The mixture is optionally heated from 30-200° C. during this time. The catalyst precursor may be added to this mixture as a solid, if a suitable solvent is employed in the previous step, or as a solution. Or alternatively, this mixture can be filtered, and the resulting solid mixed with a catalyst precursor solution. Similarly, the mixture may be vacuum dried and mixed with a catalyst precursor solution. The resulting catalyst mixture is then stirred for 1 minute to 10 hours, and the catalyst is either filtered from the solution and vacuum dried or evaporation alone removes the solvent.

Alternatively, the catalyst precursor and activator may be combined in solvent to form a solution. Then the support is added, and the mixture is stirred for 1 minute to 10 hours. The total solution volume may be greater than the pore volume of the support, but some embodiments limit the total solution volume below that needed to form a gel or slurry (about 90% to 400%, preferably about 100-200% of the pore volume). After stirring, the residual solvent is removed under vacuum, typically at ambient temperature and over 10-16 hours. But greater or lesser times and temperatures are possible.

The catalyst precursor may also be supported absent the activator; in that case, the activator (and co-activator if needed) is added to a slurry process's liquid phase. For example, a solution of catalyst precursor may be mixed with a support material for a period of about 1 minute to 10 hours. The resulting precatalyst mixture may be filtered from the solution and dried under vacuum, or evaporation alone removes the solvent. The total, catalyst-precursor-solution volume may be greater than the support's pore volume, but some embodiments limit the total solution volume below that needed to form a gel or slurry (about 90% to 400%, preferably about 100-200% of the pore volume).

Additionally, two or more different catalyst precursors may be placed on the same support using any of the support methods disclosed above. Likewise, two or more activators or an activator and co-activator may be placed on the same support.

Suitable solid particle supports are typically comprised of polymeric or refractory oxide materials, each being preferably porous. Any support material that has an average particle size greater than 10 μm is suitable for use in this invention. Various embodiments select a porous support material, such as for example, talc, inorganic oxides, inorganic chlorides, for example magnesium chloride and resinous support materials such as polystyrene polyolefin or polymeric compounds or any other organic support material and the like. Some embodiments select inorganic oxide materials as the support material including Group-2, -3, -4, -5, -13, or -14 metal or metalloid oxides. Some embodiments select the catalyst support materials to include silica, alumina, silica-alumina, and their mixtures. Other inorganic oxides may serve either alone or in combination with the silica, alumina, or silica-alumina. These are magnesia, titania, zirconia, and the like. Lewis acidic materials such as montmorillonite and similar clays may also serve as a support. In this case, the support can optionally double as the activator component. But additional activator may also be used.

The support material may be pretreated by any number of methods. For example, inorganic oxides may be calcined, chemically treated with dehydroxylating agents such as aluminum alkyls and the like, or both.

As stated above, polymeric carriers will also be suitable in accordance with the invention, see for example the descriptions in WO 95/15815 and U.S. Pat. No. 5,427,991. The methods disclosed may be used with the catalyst complexes, activators or catalyst systems of this invention to adsorb or absorb them on the polymeric supports, particularly if made up of porous particles, or may be chemically bound through functional groups bound to or in the polymer chains.

Invention catalyst carriers may have a surface area of from 10-700 m²/g, a pore volume of 0.1-4.0 cc/g and an average particle size of 10-500 μm. Some embodiments select a surface area of 50-500 m²/g, a pore volume of 0.5-3.5 cc/g, or an average particle size of 20-200 μm. Other embodiments select a surface area of 100-400 m²/g, a pore volume of 0.8-3.0 cc/g, and an average particle size of 30-100 μm. Invention carriers typically have a pore size of 10-1000 Angstroms, alternatively 50-500 Angstroms, or 75-350 Angstroms.

Invention catalysts are generally deposited on the support at a loading level of 10-100 micromoles of catalyst precursor per gram of solid support; alternately 20-80 micromoles of catalyst precursor per gram of solid support; or 40-60 micromoles of catalyst precursor per gram of support. But greater or lesser values may be used provided that the total amount of solid catalyst precursor does not exceed the support's pore volume.

Invention catalysts can be supported for gas-phase, bulk, or slurry polymerization, or otherwise as needed. Numerous support methods are known for catalysts in the olefin polymerization art, particularly alumoxane-activated catalysts; all are suitable for this invention's broadest practice. See, for example, U.S. Pat. Nos. 5,057,475 and 5,227,440. An example of supported ionic catalysts appears in WO 94/03056. U.S. Pat. No. 5,643,847 and WO 96/04319A describe a particularly effective method. A bulk or slurry process using this invention's supported metal complexes activated with alumoxane can be used for ethylene-propylene rubber as described in U.S. Pat. Nos. 5,001,205 and 5,229,478. Additionally, those processes suit this invention's catalyst systems. Both polymers and inorganic oxides may serve as supports, as is known in the art. See U.S. Pat. Nos. 5,422,325, 5,427,991, 5,498,582 and 5,466,649, and international publications WO 93/11172 and WO 94/07928.

Additionally, oxidizing agents may be added to the supported or unsupported catalyst as described in WO 01/68725.

Monomers

In a preferred embodiment the catalyst compounds of this invention are used to polymerize or oligomerize any unsaturated monomer or monomers. Preferred monomers include C₂ to C₁₀₀ olefins, preferably C₂ to C₆₀ olefins, preferably C₂ to C₄₀ olefins preferably C₂ to C₂₀ olefins, preferably C₂ to C₁₂ olefins. In some embodiments preferred monomers include linear, branched or cyclic alpha-olefins, preferably C₂ to C₁₀₀ alpha-olefins, preferably C₂ to C₆₀ alpha-olefins, preferably C₂ to C₄₀ alpha-olefins preferably C₂ to C₂₀ alpha-olefins, preferably C₂ to C₁₂ alpha-olefins. Preferred olefin monomers may be one or more of ethylene, propylene, butene, pentene, hexene, heptene, octene, nonene, decene, dodecene, 4-methylpentene-1, 3-methylpentene-1, 3,5,5-trimethylhexene-1, and 5-ethylnonene-1.

In another embodiment the polymer produced herein is a copolymer of one or more linear or branched C₃ to C₃₀ prochiral alpha-olefins or C₅ to C₃₀ ring containing olefins or combinations thereof capable of being polymerized by either stereospecific and non-stereospecific catalysts. Prochiral, as used herein, refers to monomers that favor the formation of isotactic or syndiotactic polymer when polymerized using stereospecific catalyst(s).

Preferred monomers may also include aromatic-group-containing monomers containing up to 30 carbon atoms. Suitable aromatic-group-containing monomers comprise at least one aromatic structure, preferably from one to three, more preferably a phenyl, indenyl, fluorenyl, or naphthyl moiety. The aromatic-group-containing monomer further comprises at least one polymerizable double bond such that after polymerization, the aromatic structure will be pendant from the polymer backbone. The aromatic-group containing monomer may further be substituted with one or more hydrocarbyl groups including but not limited to C₁ to C₁₀ alkyl groups. Additionally two adjacent substitutions may be joined to form a ring structure. Preferred aromatic-group-containing monomers contain at least one aromatic structure appended to a polymerizable olefinic moiety. Particularly preferred aromatic monomers include styrene, alpha-methylstyrene, para-alkylstyrenes, vinyltoluenes, vinylnaphthalene, allyl benzene, and indene, especially styrene, para-methylstyrene, 4-phenyl-1-butene and allyl benzene.

Non aromatic cyclic group containing monomers are also preferred. These monomers can contain up to 30 carbon atoms. Suitable non-aromatic cyclic group containing monomers preferably have at least one polymerizable olefinic group that is either pendant on the cyclic structure or is part of the cyclic structure. The cyclic structure may also be further substituted by one or more hydrocarbyl groups such as, but not limited to, C₁ to C₁₀ alkyl groups. Preferred non-aromatic cyclic group containing monomers include vinylcyclohexane, vinylcyclohexene, cyclopentadiene, cyclopentene, 4-methylcyclopentene, cyclohexene, 4-methylcyclohexene, cyclobutene, vinyladamantane, norbornene, 5-methylnorbornene, 5-ethylnorbornene, 5-propylnorbornene, 5-butylylnorbornene, 5-pentylnorbornene, 5-hexylnorbornene, 5-heptylnorbornene, 5-octylnorbornene, 5-nonylnorbornene, 5-decylnorbornene, 5-phenylnorbornene, vinylnorbornene, ethylidene norbornene, 5,6-dimethylnorbornene, 5,6-dibutylnorbornene and the like.

Preferred diolefin monomers useful in this invention include any hydrocarbon structure, preferably C₄ to C₃₀, having at least two unsaturated bonds, wherein at least one, typically two, of the unsaturated bonds are readily incorporated into a polymer by either a stereospecific or a non-stereospecific catalyst(s). It is further preferred that the diolefin monomers be selected from alpha-omega-diene monomers (i.e. di-vinyl monomers). More preferably, the diolefin monomers are linear di-vinyl monomers, most preferably those containing from 4 to 30 carbon atoms. Examples of preferred dienes include butadiene, pentadiene, hexadiene, heptadiene, octadiene, nonadiene, decadiene, undecadiene, dodecadiene, tridecadiene, tetradecadiene, pentadecadiene, hexadecadiene, heptadecadiene, octadecadiene, nonadecadiene, icosadiene, heneicosadiene, docosadiene, tricosadiene, tetracosadiene, pentacosadiene, hexacosadiene, heptacosadiene, octacosadiene, nonacosadiene, triacontadiene, particularly preferred dienes include 1,6-heptadiene, 1,7-octadiene, 1,8-nonadiene, 1,9-decadiene, 1,10-undecadiene, 1,11-dodecadiene, 1,12-tridecadiene, 1,13-tetradecadiene, and low molecular weight polybutadienes (Mw less than 1000 g/mol). Preferred cyclic dienes include cyclopentadiene, vinylnorbornene, norbornadiene, ethylidene norbornene, divinylbenzene, dicyclopentadiene or higher ring containing diolefins with or without substituents at various ring positions.

Non-limiting examples of preferred polar unsaturated monomers useful in this invention include nitro substituted monomers including 6-nitro-1-hexene; amine substituted monomers including N-methylallylamine, N-allylcyclopentylamine, and N-allyl-hexylanine; ketone substituted monomers including methyl vinyl ketone, ethyl vinyl ketone, and 5-hexen-2-one; aldehyde substituted monomers including acrolein, 2,2-dimethyl-4-pentenal, undecylenic aldehyde, and 2,4-dimethyl-2,6-heptadienal; alcohol substituted monomers including allyl alcohol, 7-octen-1-ol, 7-octene-1,2-diol, 10-undecen-1-ol, 10-undecene-1,2-diol, 2-methyl-3-buten-1-ol; acetal, epoxide and or ether substituted monomers including 4-hex-5-enyl-2,2-dimethyl-[1,3]dioxolane, 2,2-dimethyl-4-non-8-enyl-[1,3]dioxolane, acrolein dimethyl acetal, butadiene monoxide, 1,2-epoxy-7-octene, 1,2-epoxy-9-decene, 1,2-epoxy-5-hexene, 2-methyl-2-vinyloxirane, allyl glycidyl ether, 2,5-dihydrofuran, 2-cyclopenten-1-one ethylene ketal, 11-methoxyundec-1-ene, and 8-methoxyoct-1-ene; sulfur containing monomers including allyl disulfide; acid and ester substituted monomers including acrylic acid, vinylacetic acid, 4-pentenoic acid, 2,2-dimethyl-4-pentenoic acid, 6-heptenoic acid, trans-2,4-pentadienoic acid, 2,6-heptadienoic acid, methyl acrylate, ethyl acrylate, tert-butyl acrylate, n-butyl acrylate, methacrylic acid, methyl methacrylate, ethyl methacrylate, tert-butyl methacrylate, n-butyl methacrylate, hydroxypropyl acrylate, acetic acid oct-7-enyl ester, non-8-enoic acid methyl ester, acetic acid undec-10-enyl ester, dodec-11-enoic acid methyl ester, propionic acid undec-10-enyl ester, dodec-11-enoic acid ethyl ester, and nonylphenoxypolyetheroxy acrylate; siloxy containing monomers including trimethyloct-7-enyloxy silane, and trimethylundec-10-enyloxy silane, polar functionalized norbornene monomers including 5-norbornene-2-carbonitrile, 5-norbornene-2-carboxaldehyde, 5-norbornene-2-carboxylic acid, cis-5-norbornene-endo-2,3-dicarboxylic acid, 5-norbornene-2,2,-dimethanol, cis-5-norbornene-endo-2,3-dicarboxylic anhydride, 5-norbornene-2-endo-3-endo-dimethanol, 5-norbornene-2-endo-3-exo-dimethanol, 5-norbornene-2-methanol, 5-norbornene-2-ol, 5-norbornene-2-yl acetate, 1-[2-(5-norbornene-2-yl)ethyl]-3,5,7,9,11,13,15-heptacyclopentylpentacyclo[9.5.1.1^(3,9).1^(5,15)1^(7,13)]octasiloxane, 2-benzoyl-5-norbornene, 2-acetyl-5-norbornene, 7-syn methoxymethyl-5-norbornen-2-one, 5-norbornen-2-ol, and 5-norbornen-2-yloxy-trimethylsilane, and partially fluorinated monomers including nonafluoro-1-hexene, allyl-1,1,2,2,-tetrafluoroethyl ether, 2,2,3,3-tetrafluoro-non-8-enoic acid ethyl ester, 1,1,2,2-tetrafluoro-2-(1,1,2,2-tetrafluoro-oct-7-enyloxy)-ethanesulfonyl fluoride, acrylic acid 2,2,3,3,4,4,5,5,6,6,7,7,8,8,8-pentadecafluoro-octyl ester, and 1,1,2,2-tetrafluoro-2-(1,1,2,2,3,3,4,4-octafluoro-dec-9-enyloxy)-ethanesulfonyl fluoride.

In an embodiment herein, the process described herein is used to produce an oligomer of any of the monomers listed above. Preferred oligomers include oligomers of any C₂ to C₂₀ olefins, preferably C₂ to C₁₂ alpha-olefins, most preferably oligomers comprising ethylene, propylene and or butene are prepared. A preferred feedstock for the oligomerization process is the alpha-olefin, ethylene. But other alpha-olefins, including but not limited to propylene and 1-butene, may also be used alone or combined with ethylene. Preferred alpha-olefins include any C₂ to C₄₀ alpha-olefin, preferably and C₂ to C₂₀ alpha-olefin, preferably any C₂ to C₁₂ alpha-olefin, preferably ethylene, propylene, and butene, most preferably ethylene. Dienes may be used in the processes described herein, preferably alpha-omega-dienes are used alone or in combination with mono-alpha olefins.

In a preferred embodiment the process described herein may be used to produce homopolymers or copolymers. (For the purposes of this invention and the claims thereto a copolymer may comprise two, three, four or more different monomer units.) Preferred polymers produced herein include homopolymers or copolymers of any of the above monomers. In a preferred embodiment the polymer is a homopolymer of any C₂ to C₁₂ alpha-olefin. Preferably the polymer is a homopolymer of ethylene or a homopolymer of propylene. In another embodiment the polymer is a copolymer comprising ethylene and one or more of any of the monomers listed above. In another embodiment the polymer is a copolymer comprising propylene and one or more of any of the monomers listed above. In another preferred embodiment the homopolymers or copolymers described, additionally comprise one or more diolefin comonomers, preferably one or more C₄ to C₄₀ diolefins.

In another preferred embodiment the polymer produced herein is a copolymer of ethylene and one or more C₃ to C₂₀ linear, branched or cyclic monomers, preferably one or more C₃ to C₁₂ linear, branched or cyclic alpha-olefins. Preferably the polymer produced herein is a copolymer of ethylene and one or more of propylene, butene, pentene, hexene, heptene, octene, nonene, decene, dodecene, 4-methylpentene-1,3-methylpentene-1,3,5,5-trimethylhexene-1, cyclopentene, 4-methylcyclopentene, cyclohexene, and 4-methylcyclohexene.

In another preferred embodiment the polymer produced herein is a copolymer of propylene and one or more C₂ or C₄ to C₂₀ linear, branched or cyclic monomers, preferably one or more C₂ or C₄ to C₁₂ linear, branched or cyclic alpha-olefins. Preferably the polymer produced herein is a copolymer of propylene and one or more of ethylene, butene, pentene, hexene, heptene, octene, nonene, decene, dodecene, 4-methylpentene-1,3-methylpentene-1, and 3,5,5-trimethylhexene-1.

In a preferred embodiment, the polymer produced herein is a homopolymer of norbornene or a copolymer of norbornene and a substituted norbornene, including polar functionalized norbornenes.

In a preferred embodiment the copolymers described herein comprise at least 50 mole % of a first monomer and up to 50 mole % of other monomers.

In another embodiment, the polymer comprises:

-   -   a first monomer present at from 40 to 95 mole %, preferably 50         to 90 mole %, preferably 60 to 80 mole %, and     -   a comonomer present at from 5 to 60 mole %, preferably 10 to 40         mole %, more preferably 20 to 40 mole %, and     -   a termonomer present at from 0 to 10 mole %, more preferably         from 0.5 to 5 mole %, more preferably 1 to 3 mole %.

In a preferred embodiment the first monomer comprises one or more of any C₃ to C₈ linear branched or cyclic alpha-olefins, including propylene, butene, (and all isomers thereof), pentene (and all isomers thereof), hexene (and all isomers thereof), heptene (and all isomers thereof), and octene (and all isomers thereof). Preferred monomers include propylene, 1-butene, 1-hexene, 1-octene, cyclopentene, cyclohexene, cyclooctene, hexadiene, cyclohexadiene and the like.

In a preferred embodiment the comonomer comprises one or more of any C₂ to C₄₀ linear, branched or cyclic alpha-olefins (provided ethylene, if present, is present at 5 mole % or less), including ethylene, propylene, butene, pentene, hexene, heptene, and octene, nonene, decene, undecene, dodecene, hexadecene, butadiene, hexadiene, heptadiene, pentadiene, octadiene, nonadiene, decadiene, dodecadiene, styrene, 3,5,5-trimethylhexene-1,3-methylpentene-1,4-methylpentene-1, cyclopentadiene, and cyclohexene.

In a preferred embodiment the termonomer comprises one or more of any C₂ to C₄₀ linear, branched or cyclic alpha-olefins, (provided ethylene, if present, is present at 5 mole % or less), including ethylene, propylene, butene, pentene, hexene, heptene, and octene, nonene, decene, undecene, dodecene, hexadecene, butadiene, hexadiene, heptadiene, pentadiene, octadiene, nonadiene, decadiene, dodecadiene, styrene, 3,5,5-trimethylhexene-1,3-methylpentene-1,4-methylpentene-1, cyclopentadiene, and cyclohexene.

In a preferred embodiment the polymers described above further comprise one or more dienes at up to 10 weight %, preferably at 0.00001 to 1.0 weight %, preferably 0.002 to 0.5 weight %, even more preferably 0.003 to 0.2 weight %, based upon the total weight of the composition. In some embodiments 500 ppm or less of diene is added to the polymerization, preferably 400 ppm or less, preferably or 300 ppm or less. In other embodiments at least 50 ppm of diene is added to the polymerization, or I 00 ppm or more, or 150 ppm or more.

Oligomerization Processes

The catalyst compositions described above may be used to oligomerize or polymerize any unsaturated monomer. The choice between oligomerization and polymerization is dependent on the exact structure of the transition metal precatalyst. Those with bulkier ligands about the catalyst site, tend to produce polymers, whereas those that are less bulky about the catalyst active site, tend to produce oligomers.

In the instant oligomerization processes, the process temperature may be −100° C. to 300° C., −20° C. to 200° C., or 0° C. to 150° C. Some embodiments select oligomerization pressures (gauge) from 0 kPa-35 MPa or 500 kPa-15 MPa. In a preferred embodiment, conditions that favor oligomer production include using aluminum alkyls (as activator or scavenger, etc.) and/or selecting a transition metal precatalyst compound, particularly a nickel compound, where RI comprises phenyl that is unsubstituted in one or both ortho positions. In another preferred embodiment, the transition metal compound and the activator (and co-activator if needed) is added to the reactor separately and in the presence of olefin. A preferred feedstock for the oligomerization process is the alpha-olefin, ethylene. But other alpha-olefins, including but not limited to propylene and 1-butene, may also be used alone or combined with ethylene. Preferred alpha-olefins include any C₂ to C₄₀ alpha-olefin, preferably and C₂ to C₂₀ alpha-olefin, preferably any C₂ to C₁₂ alpha-olefin, preferably ethylene, propylene, and butene, most preferably ethylene. Dienes may be used in the processes described herein, preferably alpha, omega-dienes are used alone or in combination with mono-alpha olefins.

Preferred oligomerization processes may be run in the presence of various liquids, particularly aprotic organic liquids. Preferably the homogeneous catalyst system, ethylene, alpha-olefins, and product are soluble in these liquids. A supported (heterogeneous) catalyst system may also be used, but will form a slurry rather than a solution. Suitable liquids for both homo- and heterogeneous catalyst systems, include alkanes, alkenes, cycloalkanes, selected halogenated hydrocarbons, aromatic hydrocarbons, and in some cases, hydrofluorocarbons. In some cases, the olefin monomer may also function as the solvent. Useful solvents specifically include hexane, toluene, cyclohexane, and benzene.

The instant invention may also be used to obtain mixtures of alpha-olefins containing desirable numbers of carbon atoms. Factor K from the Schulz-Flory theory (see for instance B. Elvers, et al., Ed. Ullmann's Encyclopedia of Industrial Chemistry, Vol. A13, VCH Verlagsgesellschaft mbH, Weinheim, 1989, p. 243-247 and 275-276) serves as a measure of these α-olefins' molecular weights. From this theory, K=n(C_(n+2) olefin)/n(C_(n) olefin), where n(C_(n) olefin) is the number of moles of olefin containing n carbon atoms, and n(C_(n+2) olefin) is the number of moles of olefin containing n+2 carbon atoms, or in other words the next higher oligomer of C_(n) olefin. From this can be determined the weight (mass) fractions of the various olefins in the resulting product. The ability to vary this factor provides the ability to choose the then-desired olefins.

Invention-made alpha-olefins may be further polymerized with other olefins to form more oligomers or even form homopolymers and copolymers of the alpha olefins produced. These polymers may be made by a number of known methods, such as Ziegler-Natta-type polymerization, metallocene catalyzed polymerization, and other methods, see for instance WO 96/23010, see for instance Angew. Chem., Int. Ed. Engl., vol. 34, p. 1143-1170 (1995); European Patent Application, 416,815; and U.S. Pat. No. 5,198,401 for information about metallocene-type catalysts, and J. Boor Jr., Ziegler-Natta Catalysts and Polymerizations, Academic Press, New York, 1979 and G. Allen, et al., Ed., Comprehensive Polymer Science, Vol. 4, Pergamon Press, Oxford, 1989, pp. 1-108, 409-412 and 533-584, for information about Ziegler-Natta-type catalysts, and H. Mark, et al., Ed., Encyclopedia of Polymer Science and Engineering, Vol. 6, John Wiley & Sons, New York, 1992, p. 383-522, for information about polyethylene.

Preferred oligomerization processes include oligomerizing ethylene to C₄-C₂₆ linear alpha-olefins.

Oligomers produced herein may be used as polyolefin feed stocks. They may be used as a mixture of olefins alone, as a mixture of olefins added to other olefins, or they may be separated into fractions and then used alone or in combination with other olefins to form polyolefins. Additionally, alpha-olefins produced herein may be converted to alcohols by known processes, these alcohols being useful for a variety of applications such as intermediates for detergents or plasticizers. Typical processes for the conversion of alpha-olefins to alcohols include, but are not limited to the oxo process followed by hydrogenation, or by a modified, single-step oxo process (the modified Shell process), see for instance B. Elvers, et al., Ed., Ullmann's Encyclopedia of Chemical Technology, 5th Ed., Vol. A18, VCH Verlagsgesellschaft mbH, Weinheim, 1991, p. 321-327.

Polymerization Processes

Invention catalyst complexes are useful in polymerizing unsaturated monomers conventionally known to undergo metallocene-catalyzed polymerization such as solution, slurry, gas-phase, and high-pressure polymerization. Typically one or more transition metal compounds, one or more activators, and one or more monomers are contacted to produce polymer. These catalysts may be supported and as such will be particularly useful in the known, fixed-bed, moving-bed, fluid-bed, slurry, solution, or bulk operating modes conducted in single, series, or parallel reactors.

One or more reactors in series or in parallel may be used in the present invention. The transition metal compound, activator and when required, co-activator, may be delivered as a solution or slurry, either separately to the reactor, activated in-line just prior to the reactor, or preactivated and pumped as an activated solution or slurry to the reactor. Polymerizations are carried out in either single reactor operation, in which monomer, comonomers, catalyst/activator/co-activator, optional scavenger, and optional modifiers are added continuously to a single reactor or in series reactor operation, in which the above components are added to each of two or more reactors connected in series. The catalyst components can be added to the first reactor in the series. The catalyst component may also be added to both reactors, with one component being added to first reaction and another component to other reactors. In one preferred embodiment, the precatalyst is activated in the reactor in the presence of olefin.

Ethylene-alpha-olefin (including ethylene-cyclic olefin and ethylene-alpha-olefin-diolefin) elastomers of high molecular weight and low crystallinity can be prepared utilizing the catalysts of the invention under traditional solution processes or by introducing ethylene gas into a slurry utilizing the alpha-olefin or cyclic olefin or mixture thereof with other monomers, polymerizable and not, as a polymerization diluent in which the catalyst suspension is suspended. Typical ethylene pressures will be between 10 and 1000 psig (69-6895 kPa) and the polymerization diluent temperature will typically be between −10 and 160° C. The process can be carried out in a stirred tank reactor or a tubular reactor, or more than one reactor operated in series or in parallel. See the general disclosure of U.S. Pat. No. 5,001,205 for general process conditions. All documents are incorporated by reference for description of polymerization processes, ionic activators and useful scavenging compounds.

The invention catalyst compositions can be used individually or can be mixed with other known polymerization catalysts to prepare polymer blends. Monomer and catalyst selection allows polymer blend preparation under conditions analogous to those using individual catalysts. Polymers having increased MWD for improved processing and other traditional benefits available from polymers made with mixed catalyst systems can thus be achieved.

Generally, when using invention catalysts, particularly when they are immobilized on a support, the complete catalyst system will additionally comprise one or more scavenging compounds. Here, the term scavenging compound means a compound that removes polar impurities from the reaction environment. These impurities adversely affect catalyst activity and stability. Typically, purifying steps are usually used before introducing reaction components to a reaction vessel. But such steps will rarely allow polymerization without using some scavenging compounds. Normally, the polymerization process will still use at least small amounts of scavenging compounds.

Typically, the scavenging compound will be an organometallic compound such as the Group-13 organometallic compounds of U.S. Pat. Nos. 5,153,157, 5,241,025 and WO-A-91/09882, WO-A-94/03506, WO-A-93/14132, and that of WO 95/07941. Exemplary compounds include triethyl aluminum, triethyl borane, tri-iso-butyl aluminum, methyl alumoxane, iso-butyl alumoxane, and tri-n-octyl aluminum. Those scavenging compounds having bulky or C₆-C₂₀ linear hydrocarbyl substituents connected to the metal or metalloid center usually minimize adverse interaction with the active catalyst. Examples include triethylaluminum, but more preferably, bulky compounds such as tri-iso-butyl aluminum, tri-iso-prenyl aluminum, and long-chain linear alkyl-substituted aluminum compounds, such as tri-n-hexyl aluminum, tri-n-octyl aluminum, or tri-n-dodecyl aluminum. When alumoxane is used as the activator, any excess over that needed for activation will scavenge impurities and additional scavenging compounds may be unnecessary. Alumoxanes also may be added in scavenging quantities with other activators, e.g., methylalumoxane, [Me₂HNPh]⁺[B(pfp)₄]⁻ or B(pfp)₃ (perfluorophenyl=pfp=C₆F₅).

In terms of polymer density, the polymers capable of production in accordance the invention, can range from about 0.85 to about 0.95, preferably from 0.87 to 0.93, more preferably 0.89 to 0.920. Polymer molecular weights can range from about 3000 Mn to about 2,000,000 Mn or greater. Molecular weight distributions can range from about 1.1 to about 50.0, with molecular weight distributions from 1.2 to about 5.0 being more typical. Pigments, antioxidants and other additives, as is known in the art, may be added to the polymer.

Gas Phase Polymerization

Generally, in a fluidized gas bed process used for producing polymers, a gaseous stream containing one or more monomers is continuously cycled through a fluidized bed in the presence of a catalyst under reactive conditions. The gaseous stream is withdrawn from the fluidized bed and recycled back into the reactor. Simultaneously, polymer product is withdrawn from the reactor and fresh monomer is added to replace the polymerized monomer. (See for example U.S. Pat. Nos. 4,543,399, 4,588,790, 5,028,670, 5,317,036, 5,352,749, 5,405,922, 5,436,304, 5,453,471, 5,462,999, 5,616,661 and 5,668,228 all of which are fully incorporated herein by reference.)

The reactor pressure in a gas phase process may vary from about 10 psig (69 kPa) to about 500 psig (3448 kPa), preferably from about 100 psig (690 kPa) to about 500 psig (3448 kPa), preferably in the range of from about 200 psig (1379 kPa) to about 400 psig (2759 kPa), more preferably in the range of from about 250 psig (1724 kPa) to about 350 psig (2414 kPa).

The reactor temperature in the gas phase process may vary from about 30° C. to about 120° C., preferably from about 60° C. to about 115° C., more preferably in the range of from about 70° C. to 110° C., and most preferably in the range of from about 70° C. to about 95° C. In another embodiment when high density polyethylene is desired then the reactor temperature is typically between 70 and 105° C.

The productivity of the catalyst or catalyst system in a gas phase system is influenced by the partial pressure of the main monomer. The preferred mole percent of the main monomer, ethylene or propylene, preferably ethylene, is from about 25 to 90 mole percent and the comonomer partial pressure is in the range of from about 138 kPa to about 517 kPa, preferably about 517 kPa to about 2069 kPa, which are typical conditions in a gas phase polymerization process. Also in some systems the presence of comonomer can increase productivity.

In a preferred embodiment, the reactor utilized in the present invention is capable of producing more than 500 lbs of polymer per hour (227 Kg/hr) to about 200,000 lbs/hr (90,900 Kg/hr) or higher, preferably greater than 1000 lbs/hr (455 Kg/hr), more preferably greater than 10,000 lbs/hr (4540 Kg/hr), even more preferably greater than 25,000 lbs/hr (11,300 Kg/hr), still more preferably greater than 35,000 lbs/hr (15,900 Kg/hr), still even more preferably greater than 50,000 lbs/hr (22,700 Kg/hr) and preferably greater than 65,000 lbs/hr (29,000 Kg/hr) to greater than 100,000 lbs/hr (45,500 Kg/hr), and most preferably over 100,000 lbs/hr ( 45,500 Kg/hr).

Other gas phase processes contemplated by the process of the invention include those described in U.S. Pat. Nos. 5,627,242, 5,665,818 and 5,677,375, and European publications EP-A-0 794 200, EP-A-0 802 202 and EP-B-634 421 all of which are herein fully incorporated by reference.

In another preferred embodiment the catalyst system in is liquid form and is introduced into the gas phase reactor into a resin particle lean zone. For information on how to introduce a liquid catalyst system into a fluidized bed polymerization into a particle lean zone, please see U.S. Pat. No. 5,693,727, which is incorporated by reference herein.

Slurry Phase Polymerization

A slurry polymerization process generally operates between 1 to about 50 atmosphere pressure range (15 psig to 735 psig, 103 kPa to 5068 kPa) or even greater and temperatures in the range of 0° C. to about 120° C. In a slurry polymerization, a suspension of solid, particulate polymer is formed in a liquid polymerization diluent medium to which monomer and comonomers along with catalyst are added. The suspension including diluent is intermittently or continuously removed from the reactor where the volatile components are separated from the polymer and recycled, optionally after a distillation, to the reactor. The liquid diluent employed in the polymerization medium is typically an alkane having from 3 to 7 carbon atoms, preferably a branched alkane. The medium employed should be liquid under the conditions of polymerization and relatively inert. When a propane medium is used the process should be operated above the reaction diluent critical temperature and pressure. Preferably, a hexane or an isobutane medium is employed.

In one embodiment, a preferred polymerization technique of the invention is referred to as a particle form polymerization, or a slurry process where the temperature is kept below the temperature at which the polymer goes into solution. Such technique is well known in the art, and described in for instance U.S. Pat. No. 3,248,179 which is fully incorporated herein by reference. The preferred temperature in the particle form process is within the range of about 85° C. to about 110° C. Two preferred polymerization methods for the slurry process are those employing a loop reactor and those utilizing a plurality of stirred reactors in series, parallel, or combinations thereof. Non-limiting examples of slurry processes include continuous loop or stirred tank processes. Also, other examples of slurry processes are described in U.S. Pat. No. 4,613,484, which is herein fully incorporated by reference.

In another embodiment, the slurry process is carried out continuously in a loop reactor. The catalyst, as a slurry in isobutane or as a dry free flowing powder, is injected regularly to the reactor loop, which is itself filled with circulating slurry of growing polymer particles in a diluent of isobutane containing monomer and comonomer. Hydrogen, optionally, may be added as a molecular weight control. The reactor is maintained at a pressure of 3620 kPa to 4309 kPa and at a temperature in the range of about 60° C. to about 104° C. depending on the desired polymer melting characteristics. Reaction heat is removed through the loop wall since much of the reactor is in the form of a double-jacketed pipe. The slurry is allowed to exit the reactor at regular intervals or continuously to a heated low pressure flash vessel, rotary dryer and a nitrogen purge column in sequence for removal of the isobutane diluent and all unreacted monomer and comonomers. The resulting hydrocarbon free powder is then compounded for use in various applications.

In another embodiment, the reactor used in the slurry process of the invention is capable of and the process of the invention is producing greater than 2000 lbs of polymer per hour (907 Kg/hr), more preferably greater than 5000 lbs/hr (2268 Kg/hr), and most preferably greater than 10,000 lbs/hr (4540 Kg/hr). In another embodiment the slurry reactor used in the process of the invention is producing greater than 15,000 lbs of polymer per hour (6804 Kg/hr), preferably greater than 25,000 lbs/hr (11,340 Kg/hr) to about 100,000 lbs/hr (45,500 Kg/hr).

In another embodiment in the slurry process of the invention the total reactor pressure is in the range of from 400 psig (2758 kPa) to 800 psig (5516 kPa), preferably 450 psig (3103 kPa) to about 700 psig (4827 kPa), more preferably 500 psig (3448 kPa) to about 650 psig (4482 kPa), most preferably from about 525 psig (3620 kPa) to 625 psig (4309 kPa).

In yet another embodiment in the slurry process of the invention the concentration of predominant monomer in the reactor liquid medium is in the range of from about 1 to 10 weight percent, preferably from about 2 to about 7 weight percent, more preferably from about 2.5 to about 6 weight percent, most preferably from about 3 to about 6 weight percent.

Another process of the invention is where the process, preferably a slurry or gas phase process is operated in the absence of or essentially free of any scavengers, such as triethylaluminum, trimethylaluminum, tri-iso-butylaluminum and tri-n-hexylaluminum and diethyl aluminum chloride, dibutyl zinc and the like. This process is described in PCT publication WO 96/08520 and U.S. Pat. No. 5,712,352, which are herein fully incorporated by reference.

In another embodiment the process is run with scavengers. Typical scavengers include trimethyl aluminum, tri-iso-butyl aluminum and an excess of alumoxane or modified alumoxane.

Homogeneous, Bulk or solution Phase Polymerization

The catalysts described herein can be used advantageously in homogeneous solution processes. Generally this involves polymerization in a continuous reactor in which the polymer formed and the starting monomer and catalyst materials supplied, are agitated to reduce or avoid concentration gradients. Suitable processes operate above the melting point of the polymers at high pressures, from 1 to 3000 bar (10-30,000 MPa), in which the monomer acts as diluent or in solution polymerization using a solvent.

Temperature control in the reactor is obtained by balancing the heat of polymerization and with reactor cooling by reactor jackets or cooling coils to cool the contents of the reactor, auto refrigeration, pre-chilled feeds, vaporization of liquid medium (diluent, monomers or solvent) or combinations of all three. Adiabatic reactors with pre-chilled feeds may also be used. The reactor temperature depends on the catalyst used. In general, the reactor temperature preferably can vary between about 0° C. and about 160° C., more preferably from about 10° C. to about 140° C., and most preferably from about 40° C. to about 120° C. In series operation, the second reactor temperature is preferably higher than the first reactor temperature. In parallel reactor operation, the temperatures of the two reactors are independent. The pressure can vary from about 1 mm Hg to 2500 bar (25,000 MPa), preferably from 0.1 bar to 1600 bar (1-16,000 MPa), most preferably from 1.0 to 500 bar (10-5000 MPa).

Each of these processes may also be employed in single reactor, parallel or series reactor configurations. The liquid processes comprise contacting olefin monomers with the above described catalyst system in a suitable diluent or solvent and allowing said monomers to react for a sufficient time to produce the desired polymers. Hydrocarbon solvents are suitable, both aliphatic and aromatic. Alkanes, such as hexane, pentane, isopentane, and octane, are preferred.

The process can be carried out in a continuous stirred tank reactor, batch reactor, or plug flow reactor, or more than one reactor operated in series or parallel. These reactors may have or may not have internal cooling and the monomer feed may or may not be refrigerated. See the general disclosure of U.S. Pat. No. 5,001,205 for general process conditions. See also, international application WO 96/33227 and WO 97/22639.

Medium and High Pressure Polymerizations

In the high pressure process for the polymerization of ethylene alone or in combination with C₃ to C₁₀ alpha-olefins and optionally other copolymerizable olefins, the temperature of the medium within which the polymerization reaction occurs is at least 120° C. and preferably above 140° C. and may range to 350° C., but below the decomposition temperature of said polymer product, typically from 310° C. to 325° C. Preferably, the polymerization is completed at a temperature within the range of 130° C. to 230° C. The polymerization is completed at a pressure above 200 bar (20 MPa), and generally at a pressure within the range of 500 bar (50 MPa) to 3500 bar (350 MPa). Preferably, the polymerization is completed at a pressure within the range from 800 bar (80 MPa) to 2500 bar (250 MPa).

For medium pressure process, the temperature within which the polymerization reaction occurs is at least 80° C. and ranges from 80° C. to 250° C., preferably from 100° C. to 220° C., and should for a given polymer in the reactor, be above the melting point of said polymer so as to maintain the fluidity of the polymer-rich phase. The pressure can be varied between 100 and 1000 bar for ethylene homopolymers and from 30 bar (3 MPa) to 1000 bar (100 MPa), especially 50 bar (5 MPa) to 500 bar (50 MPa) for processes producing ethylene copolymers containing C₃ to C₁₀ olefins and optionally other copolymerizable olefins.

More recently, polymerization conditions for high pressure and or temperature polymerizations to prepare propylene homopolymers and copolymers of propylene with C₃ to C₁₀ olefins and optionally other copolymerizable olefins have been reported. See U.S. patent applications 60/431,185 filed Dec. 5, 2002; 60/431,077, filed Dec. 5, 2002; and 60/412,541, filed Sep. 20, 2002.

After polymerization and deactivation of the catalyst, the polymer product can be recovered by processes well known in the art. Any excess reactants may be flashed off from the polymer and the polymer obtained extruded into water and cut into pellets or other suitable comminuted shapes. For general process conditions, see the general disclosure of U.S. Pat. Nos. 5,084,534, 5,408,017, 6,127,497, 6,255,410, which are incorporated herein by reference.

A set of exemplary catalyst precursors is set out below. These are by way of example only and are not intended to list every catalyst precursor that is within the scope of the invention.

Examples of compounds with ligand type L*1 include:

-   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butylcatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-bromocatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-dibromocatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-fluorocatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4,5-difluorocatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-dimethoxycatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-ethoxycatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-diethoxycatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-propoxycatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-dipropoxycatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-butoxyoxycatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-dibutoxycatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4,5-di-iso-propylcatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butylcatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butyl-6-chlorocatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butyl-6-bromocatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butyl-6-fluorocatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butyl-6-nitrocatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butylcatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butyl-4-chlorocatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butvl-4,5-dichlorocatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butyl-4-bromocatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butvl-4,5-dibromocatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butyl-4-fluorocatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butyl-4,5-difluorocatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-l,3-butadiene]nickel(II)     [3,6-di-n-butyl-4-methoxycatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butvl-4,5-dimethoxycatecholate],     [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butyl-4-ethoxycatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butvl-4,5-diethoxycatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butyl-4-propoxycatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butvl-4,5-dipropoxycatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butyl-4-butoxyoxycatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butvl-4,5-dibutoxycatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butyl-4-iso-propylcatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butyl-4,5-di-iso-propylcatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene)     nickel(II) [3,6-di-n-butyl-4-cyclohexylcatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-n-butylcatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-n-butyl-6-chlorocatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-n-butyl-6-bromocatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-n-butyl-6-fluorocatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-n-butyl-6-nitrocatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butylcatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-chlorocatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadienel     nickel(II) [3,6-di-iso-butvl-4,5-dichlorocatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-bromocatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butvl-4,5-dibromocatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene)     nickel(II) [3,6-di-iso-butyl-4-fluorocatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4,5-difluorocatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-methoxycatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butvl-4,5-dimethoxycatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-ethoxycatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butvl-4,5-diethoxycatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-propoxycatecholate],     [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butvl-4,5-dipropoxycatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-butoxyoxycatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butvl-4,5-dibutoxycatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-iso-propylcatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4,5-di-iso-propylcatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-cyclohexylcatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-iso-butylcatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-iso-butyl-6-chlorocatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-iso-butyl-6-bromocatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-iso-butyl-6-fluorocatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-iso-butyl-6-nitrocatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propylcatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4-chlorocatecholate],     [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4,5-dichlorocatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4-bromocatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4,5-dibromocatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4-fluorocatecholate],     [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4,5-difluorocatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4-methoxycatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4,5-dimethoxycatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4-ethoxycatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4,5-diethoxycatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4-propoxycatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4,5-dipropoxycatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4-butoxycatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4,5-dibutoxycatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,4,5,6-tetra-iso-propylcatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4-cyclohexylcatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-iso-propylcatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,4,6-tri-n-propylcatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-propylcatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-n-propylcatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethylcatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4-chlorocatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4,5-dichlorocatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4-bromocatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4,5-dibromocatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4-fluorocatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4,5-difluorocatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4-methoxycatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4,5-dimethoxycatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4-ethoxycatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4,5-diethoxycatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4-propoxycatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4,5-dipropoxycatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4-butoxycatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-daza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4,5-dibutoxycatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-dimethylcatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [1,4,6,8-tetra-tert-butyldibenzo[1,4]dioxine-2,3-diolate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [1,4,6,7,8,9-hexachlorodibenzo[1,4]dioxine-2,3-diolate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [1,4,6,7,8,9-hexabromodibenzo[1,4]dioxine-2,3-diolate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,4,5,6-tetrachlorocatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,4,5,6-tetrabromocatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,4,5,6-tetrafluorocatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dichlorocatechlote], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [4-methylcatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [naphthalene-2,3-diolate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [phenanthrene-9,10-diolate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     catecholate, -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butylcatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-dichlorocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-bromocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-dibromocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-fluorocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4,5-difluorocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-dimethoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-ethoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-diethoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-propoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-isopropylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-dipropoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-butoxyoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-dibutoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4,5-di-iso-propylcatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butylcatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butyl-6-chlorocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butyl-6-bromocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butyl-6-fluorocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butyl-6-nitrocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butylcatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butyl-4-chlorocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butvl-4,5-dichlorocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butyl-4-bromocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butvl-4,5-dibromocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butyl-4-fluorocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butyl-4,5-difluorocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butyl-4-methoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butvl-4,5-dimethoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butyl-4-ethoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butvl-4,5-diethoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butyl-4-propoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butvl-4,5-dipropoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butyl-4-butoxyoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butvl-4,5-dibutoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butyl-4-iso-propylcatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butyl-4,5-di-iso-propylcatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butyl-4-cyclohexylcatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-n-butylcatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-n-butyl-6-chlorocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-n-butyl-6-bromocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5,-di-n-butyl-6-fluorocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-n-butyl-6-nitrocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butylcatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl4-chlorocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butvl-4,5-dichlorocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-bromocatecholate],     [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butvl-4,5-dibromocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-fluorocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4,5-difluorocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-methoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butvl-4,5-dimethoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-ethoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butvl-4,5-diethoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-propoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butvl-4,5-dipropoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-butoxyoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butvl-4,5-dibutoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-iso-propylcatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4,5-di-iso-propylcatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-cyclohexylcatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-iso-butylcatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-iso-butyl-6-chlorocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-iso-butyl-6-bromocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-iso-butyl-6-fluorocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-iso-butyl-6-nitrocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propylcatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4-chlorocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4,5-dichlorocatecholate], -   (2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4-bromocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4,5-dibromocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4-fluorocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4,5-difluorocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4-methoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4,5-dimethoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl4-ethoxycatecholate], -   (2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4,5-diethoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4-propoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4,5-dipropoxycatecholate],     [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4-butoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4,5-dibutoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,4,5,6-tetra-iso-propylcatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4-cyclohexylcatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-iso-propylcatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,4,6-tri-n-propylcatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-propylcatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-n-propylcatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethylcatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4-chlorocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4,5-dichlorocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(1I)     [3,6-dimethyl-4-bromocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4,5-dibromocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(I)     [3,6-dimethyl-4-fluorocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4,5-difluorocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4-methoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4,5-dimethoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4-ethoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4,5-diethoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4-propoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4,5-dipropoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4-butoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4,5-dibutoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-dimethylcatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [1,4,6,8-tetra-tert-butyldibenzo[1,4]dioxine-2,3-diolate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [1,4,6,7,8,9-hexachlorodibenzo[1,4]dioxine-2,3-diolate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [1,4,6,7,8,9-hexabromodibenzo[1,4]dioxine-2,3-diolate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,4,5,6-tetrachlorocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,4,5,6-tetrabromocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,4,5,6-tetrafluorocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dichlorocatechlote], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [4-methylcatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [naphthalene-2,3-diolate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [phenanthrene-9,10-diolate], -   [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     catecholate, -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butylcatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl4-chlorocatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-dichlorocatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-bromocatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-dibromocatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene)     nickel(II) [3,6-di-tert-butyl-4-fluorocatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4,5-difluorocatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-dimethoxycatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-ethoxycatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-diethoxycatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-propoxycatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-dipropoxycatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-butoxyoxycatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-dibutoxycatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4,5-di-iso-propylcatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butylcatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butyl-6-chlorocatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butyl-6-bromocatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butyl-6-fluorocatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butyl-6-nitrocatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butylcatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butyl-4-chlorocatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butvl-4,5-dichlorocatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butyl-4-bromocatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butvl-4,5-dibromocatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butyl-4-fluorocatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butyl-4,5-difluorocatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butyl-4-methoxycatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butvl-4,5-dimethoxycatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butyl-4-ethoxycatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butvl-4,5-diethoxycatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butyl-4-propoxycatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butvl-4,5-dipropoxycatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butyl-4-butoxyoxycatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butvl-4,5-dibutoxycatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butyl-4-iso-propylcatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butyl-4,5-di-iso-propylcatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butyl-4-cyclohexylcatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-n-butylcatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-n-butyl-6-chlorocatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-n-butyl-6-bromocatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-n-butyl-6-fluorocatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-n-butyl-6-nitrocatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butylcatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-chlorocatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butvl-4,5-dichlorocatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-bromocatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butvl-4,5-dibromocatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-fluorocatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4,5-difluorocatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-methoxycatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butvl-4,5-dimethoxycatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-ethoxycatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butvl-4,5-diethoxycatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-propoxycatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butvl-4,5-dipropoxycatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-butoxyoxycatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butvl-4,5-dibutoxycatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-iso-propylcatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4,5-di-iso-propylcatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-cyclohexylcatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-iso-butylcatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-iso-butyl-6-chlorocatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-iso-butyl-6-bromocatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-iso-butyl-6-fluorocatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-iso-butyl-6-nitrocatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propylcatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4-chlorocatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4,5-dichlorocatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4-bromocatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4,5-dibromocatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4-fluorocatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4,5-difluorocatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4-methoxycatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4,5-dimethoxycatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4-ethoxycatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4,5-diethoxycatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4-propoxycatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4,5-dipropoxycatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4-butoxycatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4,5-dibutoxycatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,4,5,6-tetra-iso-propylcatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4-cyclohexylcatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-iso-propylcatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,4,6-tri-n-propylcatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-propylcatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-n-propylcatecholate],     [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethylcatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4-chlorocatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4,5-dichlorocatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4-bromocatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4,5-dibromocatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4-fluorocatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4,5-difluorocatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4-methoxycatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4,5-dimethoxycatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4-ethoxycatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4,5-diethoxycatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4-propoxycatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4,5-dipropoxycatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4-butoxycatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4,5-dibutoxycatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-dimethylcatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [1,4,6,8-tetra-tert-butyldibenzo[1,4]dioxine-2,3-diolate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [1,4,6,7,8,9-hexachlorodibenzo[1,4]dioxine-2,3-diolate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [1,4,6,7,8,9-hexabromodibenzo[1,4]dioxine-2,3-diolate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,4,5,6-tetrachlorocatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,4,5,6-tetrabromocatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,4,5,6-tetrafluorocatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dichlorocatechlote], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [4-methylcatecholate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [naphthalene-2,3-diolate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [phenanthrene-9,10-diolate], -   [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     catecholate, -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butylcatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-dichlorocatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-bromocatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-dibromocatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-fluorocatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4,5-difluorocatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-dimethoxycatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-ethoxycatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-diethoxycatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-propoxycatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-dipropoxycatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-butoxyoxycatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-dibutoxycatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4,5-di-iso-propylcatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butylcatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butyl-6-chlorocatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butyl-6-bromocatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butyl-6-fluorocatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butyl-6-nitrocatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butylcatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butyl-4-chlorocatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butvl-4,5-dichlorocatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butyl-4-bromocatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butvl-4,5-dibromocatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butyl-4-fluorocatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butyl-4,5-difluorocatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butyl-4-methoxycatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butvl-4,5-dimethoxycatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butyl-4-ethoxycatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butvl-4,5-diethoxycatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butyl-4-propoxycatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butvl-4,5-dipropoxycatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butyl-4-butoxyoxycatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butvl-4,5-dibutoxycatecholate],     [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butyl-4-iso-propylcatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene)     nickel(II) [3,6-di-n-butyl-4,5-di-iso-propylcatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-butyl-4-cyclohexylcatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-n-butylcatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-n-butyl-6-chlorocatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-n-butyl-6-bromocatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-n-butyl-6-fluorocatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-n-butyl-6-nitrocatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butylcatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-chlorocatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butvl-4,5-dichlorocatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-bromocatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butvl-4,5-dibromocatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl4-fluorocatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4,5-difluorocatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-methoxycatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butvl-4,5-dimethoxycatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-ethoxycatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butvl-4,5-diethoxycatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-propoxycatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butvl-4,5-dipropoxycatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-butoxyoxycatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butvl-4,5-dibutoxycatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-iso-propylcatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4,5-di-iso-propylcatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-cyclohexylcatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-iso-butylcatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-iso-butyl-6-chlorocatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-iso-butyl-6-bromocatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-iso-butyl-6-fluorocatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-iso-butyl-6-nitrocatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propylcatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4-chlorocatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4,5-dichlorocatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4-bromocatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4,5-dibromocatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4-fluorocatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4,5-difluorocatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4-methoxycatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4,5-dimethoxycatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4-ethoxycatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4,5-diethoxycatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4-propoxycatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4,5-dipropoxycatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4-butoxycatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4,5-dibutoxycatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,4,5,6-tetra-iso-propylcatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4-cyclohexylcatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-iso-propylcatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,4,6-tri-n-propylcatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-propylcatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-n-propylcatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethylcatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4-chlorocatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4,5-dichlorocatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4-bromocatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4,5-dibromocatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4-fluorocatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4,5-difluorocatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4-methoxycatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4,5-dimethoxycatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4-ethoxycatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4,5-diethoxycatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4-propoxycatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4,5-dipropoxycatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4-butoxycatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4,5-dibutoxycatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-dimethylcatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [1,4,6,8-tetra-tert-butyldibenzo[1,4]dioxine-2,3-diolate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [1,4,6,7,8,9-hexachlorodibenzo[1,4]dioxine-2,3-diolate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [1,4,6,7,8,9-hexabromodibenzo[1,4]dioxine-2,3-diolate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,4,5,6-tetrachlorocatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,4,5,6-tetrabromocatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,4,5,6-tetrafluorocatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dichlorocatechlote], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [4-methylcatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [naphthalene-2,3-diolate], -   [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [phenanthrene-9,10-diolate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butylcatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butvl-4,5-dichlorocatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butyl-4-bromocatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butvl-4,5-dibromocatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butyl-4-fluorocatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butyl-4,5-difluorocatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butvl-4,5-dimethoxycatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butyl-4-ethoxycatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butvl-4,5-diethoxycatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butyl-4-propoxycatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butvl-4,5-dipropoxycatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butyl-4-butoxyoxycatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butvl-4,5-dibutoxycatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butyl-4,5-di-iso-propylcatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,5-di-tert-butylcatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,5-di-tert-butyl-6-chlorocatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,5-di-tert-butyl-6-bromocatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,5-di-tert-butyl-6-fluorocatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,5-di-tert-butyl-6-nitrocatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-n-butylcatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-n-butyl-4-chlorocatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-n-butvl-4,5-dichlorocatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-n-butyl-4-bromocatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-n-butvl-4,5-dibromocatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-n-butyl-4-fluorocatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-n-butyl-4,5-difluorocatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-n-butyl-4-methoxycatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-n-butvl-4,5-dimethoxycatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-n-butyl-4-ethoxycatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-n-butvl-4,5-diethoxycatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene nickel(II)     [3,6-di-n-butyl-4-propoxycatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-n-butvl-4,5-dipropoxycatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-n-butyl-4-butoxyoxycatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-n-butvl-4,5-dibutoxycatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-n-butyl-4-iso-propylcatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-n-butyl-4,5-di-iso-propylcatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-n-butyl-4-cyclohexylcatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,5-di-n-butylcatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,5-di-n-butyl-6-chlorocatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,5-di-n-butyl-6-bromocatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,5-di-n-butyl-6-fluorocatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,5-di-n-butyl-6-nitrocatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butylcatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butyl-4-chlorocatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butvl-4,5-dichlorocatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butyl-4-bromocatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butvl-4,5-dibromocatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butyl-4-fluorocatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butyl-4,5-difluorocatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butyl-4-methoxycatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butvl-4,5-dimethoxycatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butyl-4-ethoxycatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butvl-4,5-diethoxycatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butyl-4-propoxycatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butvl-4,5-dipropoxycatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butyl-4-butoxyoxycatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butvl-4,5-dibutoxycatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butyl-4-iso-propylcatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butyl-4,5-di-iso-propylcatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butyl-4-cyclohexylcatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,5-di-iso-butylcatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,5-di-iso-butyl-6-chlorocatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,5-di-iso-butyl-6-bromocatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,5-di-iso-butyl-6-fluorocatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,5-di-iso-butyl-6-nitrocatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propylcatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4-chlorocatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4,5-dichlorocatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4-bromocatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4,5-dibromocatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4-fluorocatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4,5-difluorocatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4-methoxycatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4,5-dimethoxycatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4-ethoxycatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4,5-diethoxycatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4-propoxycatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4,5-dipropoxycatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl4-butoxycatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4,5-dibutoxycatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,4,5,6-tetra-iso-propylcatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4-cyclohexylcatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,5-di-iso-propylcatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,4,6-tri-n-propylcatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-n-propylcatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,5-di-n-propylcatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-dimethylcatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-dimethyl-4-chlorocatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-dimethyl-4,5-dichlorocatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-dimethyl-4-bromocatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-dimethyl-4,5-dibromocatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-dimethyl-4-fluorocatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-dimethyl-4,5-difluorocatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-dimethyl-4-methoxycatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-dimethyl-4,5-dimethoxycatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-dimethyl-4-ethoxycatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-dimethyl-4,5-diethoxycatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-dimethyl-4-propoxycatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-dimethyl-4,5-dipropoxycatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-dimethyl-4-butoxycatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-dimethyl-4,5-dibutoxycatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,5-dimethylcatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [1,4,6,8-tetra-tert-butyldibenzo[1,4]dioxine-2,3-diolate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [1,4,6,7,8,9-hexachlorodibenzo[1,4]dioxine-2,3-diolate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [1,4,6,7,8,9-hexabromodibenzo[1,4]dioxine-2,3-diolate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,4,5,6-tetrachlorocatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,4,5,6-tetrabromocatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,4,5,6-tetrafluorocatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-dichlorocatechlote], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [4-methylcatecholate], -   [naphthalene-2,3-diolate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [phenanthrene-9,10-diolate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     catecholate, -   [1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butylcatecholate], -   [1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-dichlorocatecholate], -   [1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-fluorocatecholate], -   [1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4,5-difluorocatecholate], -   [1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-dimethoxycatecholate], -   [1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butylcatecholate], -   [1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butyl-6-chlorocatecholate], -   [1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butyl-6-nitrocatecholate], -   [1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propylcatecholate], -   [1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-dimethylcatecholate], -   [1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [1,4,6,8-tetra-tert-butyldibenzo[1,4]dioxine-2,3-diolate], -   [1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [1,4,6,7,8,9-hexachlorodibenzo[1,4]dioxine-2,3-diolate], -   [1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [1,4,6,7,8,9-hexabromodibenzo[1,4]dioxine-2,3-diolate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butylcatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-dichlorocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-bromocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-dibromocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-fluorocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4,5-difluorocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-dimethoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-ethoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-diethoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-propoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-dipropoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-butoxyoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-dibutoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4,5-di-iso-propylcatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butylcatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butyl-6-chlorocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butyl-6-bromocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butyl-6-fluorocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butyl-6-nitrocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butylcatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-chlorocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butvl-4,5-dichlorocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-bromocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butvl-4,5-dibromocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-fluorocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4,5-difluorocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-methoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butvl-4,5-dimethoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-ethoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butvl4,5-diethoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-propoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butvl-4,5-dipropoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-butoxyoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butvl-4,5-dibutoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-iso-propylcatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4,5-di-iso-propylcatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-cyclohexylcatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-iso-butylcatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-iso-butyl-6-chlorocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-iso-butyl-6-bromocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-iso-butyl-6-fluorocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-iso-butyl-6-nitrocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propylcatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4-chlorocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4,5-dichlorocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4-bromocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4,5-dibromocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4-fluorocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4,5-difluorocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4-methoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4,5-dimethoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4-ethoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl4,5-diethoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4-propoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4,5-dipropoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4-butoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4,5-dibutoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,4,5,6-tetra-iso-propylcatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4-cyclohexylcatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-iso-propylcatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,4,6-tri-n-propylcatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-propylcatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-n-propylcatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethylcatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4-chlorocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4,5-dichlorocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4-bromocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4,5-dibromocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4-fluorocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4,5-difluorocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4-methoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4,5-dimethoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4-ethoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4,5-diethoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4-propoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4,5-dipropoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4-butoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4,5-dibutoxycatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-dimethylcatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [1,4,6,8-tetra-tert-butyldibenzo[1,4]dioxine-2,3-diolate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [1,4,6,7,8,9-hexachlorodibenzo[1,4]dioxine-2,3-diolate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [1,4,6,7,8,9-hexabromodibenzo[1,4]dioxine-2,3-diolate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,4,5,6-tetrachlorocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,4,5,6-tetrabromocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,4,5,6-tetrafluorocatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dichlorocatechlate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [4-methylcatecholate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [naphthalene-2,3-diolate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [phenanthrene-9,10-diolate], -   [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     catecholate, -   [2-methyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butylcatecholate], -   [2-methyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-methyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-dichlorocatecholate], -   [2-methyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-fluorocatecholate], -   [2-methyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4,5-difluorocatecholate], -   [2-methyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-methyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-dimethoxycatecholate], -   [2-methyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [2-methyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [2-methyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butylcatecholate], -   [2-methyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butyl-6-chlorocatecholate], -   [2-methyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butyl-6-nitrocatecholate], -   [2-methyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [2-methyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propylcatecholate], -   [2-methyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [1,4,6,8-tetra-tert-butyldibenzo[1,4]dioxine-2,3-diolate], -   [2-methyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [1,4,6,7,8,9-hexachlorodibenzo[1,4]dioxine-2,3-diolate], -   [2-methyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [1,4,6,7,8,9-hexabromodibenzo[1,4]dioxine-2,3-diolate], -   [2-methyl-3-propyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butylcatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-dichlorocatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-fluorocatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4,5-difluorocatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-dimethoxycatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butylcatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butyl-6-chlorocatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butyl-6-nitrocatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propylcatecholate], -   [2-methyl-3-propyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [1,4,6,8-tetra-tert-butyldibenzo[1,4]dioxine-2,3-diolate], -   [2-methyl-3-propyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [1,4,6,7,8,9-hexachlorodibenzo[1,4]dioxine-2,3-diolate], -   [2-methyl-3-propyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [1,4,6,7,8,9-hexabromodibenzo[1,4]dioxine-2,3-diolate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butylcatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butvl-4,5-dichlorocatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butyl-4-bromocatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butvl-4,5-dibromocatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butyl-4-fluorocatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butyl-4,5-difluorocatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butvl-4,5-dimethoxycatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butyl-4-ethoxycatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butvl-4,5-diethoxycatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butyl-4-propoxycatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butvl-4,5-dipropoxycatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butyl-4-butoxyoxycatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butvl-4,5-dibutoxycatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butyl-4,5-di-iso-propylcatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,5-di-tert-butylcatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,5-di-tert-butyl-6-chlorocatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,5-di-tert-butyl-6-bromocatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,5-di-tert-butyl-6-fluorocatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,5-di-tert-butyl-6-nitrocatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butylcatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butyl-4-chlorocatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butvl-4,5-dichlorocatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butyl-4-bromocatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butvl-4,5-dibromocatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butyl-4-fluorocatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butyl-4,5-difluorocatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butyl-4-methoxycatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butvl-4,5-dimethoxycatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butyl-4-ethoxycatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butvl-4,5-diethoxycatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butyl-4-propoxycatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butvl-4,5-dipropoxycatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butyl-4-butoxyoxycatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butvl-4,5-dibutoxycatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butyl-4-iso-propylcatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butyl-4,5-di-iso-propylcatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butyl-4-cyclohexylcatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,5-di-iso-butylcatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,5-di-iso-butyl-6-chlorocatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,5-di-iso-butyl-6-bromocatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,5-di-iso-butyl-6-fluorocatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,5-di-iso-butyl-6-nitrocatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propylcatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4-chlorocatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4,5-dichlorocatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4-bromocatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4,5-dibromocatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4-fluorocatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4,5-difluorocatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4-methoxycatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4,5-dimethoxycatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4-ethoxycatecholate), -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4,5-diethoxycatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4-propoxycatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4,5-dipropoxycatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4-butoxycatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4,5-dibutoxycatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,4,5,6-tetra-iso-propylcatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4-cyclohexylcatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,5-di-iso-propylcatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,4,6-tri-n-propylcatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-di-n-propylcatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,5-di-n-propylcatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-dimethylcatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-dimethyl-4-chlorocatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-dimethyl-4,5-dichlorocatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-dimethyl-4-bromocatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-dimethyl-4,5-dibromocatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-dimethyl-4-fluorocatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-dimethyl-4,5-difluorocatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-dimethyl-4-methoxycatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-dimethyl-4,5-dimethoxycatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-dimethyl-4-ethoxycatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-dimethyl-4,5-diethoxycatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-dimethyl-4-propoxycatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-dimethyl-4,5-dipropoxycatechol ate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-dimethyl-4-butoxycatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-dimethyl-4,5-dibutoxycatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,5-dimethylcatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [1,4,6,8-tetra-tert-butyldibenzo[1,4]dioxine-2,3-diolate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [1,4,6,7,8,9-hexachlorodibenzo[1,4]dioxine-2,3-diolate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [1,4,6,7,8,9-hexabromodibenzo[1,4]dioxine-2,3-diolate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,4,5,6-tetrachlorocatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,4,5,6-tetrabromocatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,4,5,6-tetrafluorocatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [3,6-dichlorocatechlote], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [4-methylcatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [naphthalene-2,3-diolate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     [phenanthrene-9,10-diolate], -   [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II)     catecholate, -   [1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butylcatecholate], -   [1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-dichlorocatecholate], -   [1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-fluorocatecholate], -   [1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4,5-difluorocatecholate], -   [1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-dimethoxycatecholate], -   [1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butylcatecholate], -   [1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butyl-6-chlorocatecholate], -   [1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butyl-6-nitrocatecholate], -   [1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propylcatecholate], -   [1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-dimethylcatecholate], -   [1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [1,4,6,8-tetra-tert-butyldibenzo[1,4]dioxine-2,3-diolate], -   [1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [1,4,6,7,8,9-hexachlorodibenzo[1,4]dioxine-2,3-diolate], -   [1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [1,4,6,7,8,9-hexabromodibenzo[1,4]dioxine-2,3-diolate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butylcatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-dichlorocatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-bromocatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-dibromocatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-fluorocatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4,5-difluorocatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-dimethoxycatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-ethoxycatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-diethoxycatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-propoxycatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-dipropoxycatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-butoxyoxycatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-dibutoxycatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate), -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4,5-di-iso-propylcatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butylcatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butyl-6-chlorocatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butyl-6-bromocatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butyl-6-fluorocatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butyl-6-nitrocatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butylcatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-chlorocatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butvl-4,5-dichlorocatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-bromocatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butvl-4,5-dibromocatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-fluorocatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4,5-difluorocatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-methoxycatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butvl-4,5-dimethoxycatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-ethoxycatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butvl-4,5-diethoxycatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-propoxycatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butvl-4,5-dipropoxycatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-butoxyoxycatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butvl-4,5-dibutoxycatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-iso-propylcatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4,5-di-iso-propylcatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-cyclohexylcatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-iso-butylcatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-iso-butyl-6-chlorocatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-iso-butyl-6-bromocatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-iso-butyl-6-fluorocatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-iso-butyl-6-nitrocatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propylcatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4-chlorocatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4,5-dichlorocatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4-bromocatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4,5-dibromocatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4-fluorocatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4,5-difluorocatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4-methoxycatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4,5-dimethoxycatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4-ethoxycatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4,5-diethoxycatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4-propoxycatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4,5-dipropoxycatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4-butoxycatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4,5-dibutoxycatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,4,5,6-tetra-iso-propylcatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4-cyclohexylcatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-iso-propylcatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,4,6-tri-n-propylcatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-propylcatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-n-propylcatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethylcatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4-chlorocatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4,5-dichlorocatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4-bromocatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4,5-dibromocatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4-fluorocatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4,5-difluorocatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4-methoxycatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4,5-dimethoxycatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4-ethoxycatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4,5-diethoxycatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4-propoxycatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4,5-dipropoxycatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4-butoxycatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4,5-dibutoxycatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-dimethylcatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [1,4,6,8-tetra-tert-butyldibenzo[1,4]dioxine-2,3-diolate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [1,4,6,7,8,9-hexachlorodibenzo[1,4]dioxine-2,3-diolate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [1,4,6,7,8,9-hexabromodibenzo[1,4]dioxine-2,3-diolate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,4,5,6-tetrachlorocatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,4,5,6-tetrabromocatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,4,5,6-tetrafluorocatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dichlorocatechlote], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [4-methylcatecholate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [naphthalene-2,3-diolate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [phenanthrene-9,10-diolate], -   [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     catecholate, -   [2-methyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butylcatecholate], -   [2-methyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-methyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-dichlorocatecholate], -   [2-methyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-fluorocatecholate], -   [2-methyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4,5-difluorocatecholate], -   [2-methyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-methyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-dimethoxycatecholate], -   [2-methyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [2-methyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [2-methyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butylcatecholate], -   [2-methyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butyl-6-chlorocatecholate], -   [2-methyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butyl-6-nitrocatecholate], -   [2-methyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [2-methyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propylcatecholate], -   [2-methyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [1,4,6,8-tetra-tert-butyldibenzo[1,4]dioxine-2,3-diolate], -   [2-methyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [1,4,6,7,8,9-hexachlorodibenzo[1,4]dioxine-2,3-diolate], -   [2-methyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [1,4,6,7,8,9-hexabromodibenzo[1,4]dioxine-2,3-diolate], -   [2-methyl-3-propyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butylcatecholate], -   [2-methyl-3-propyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-methyl-3-propyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-dichlorocatecholate], -   [2-methyl-3-propyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-fluorocatecholate], -   [2-methyl-3-propyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4,5-difluorocatecholate], -   [2-methyl-3-propyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-methyl-3-propyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-dimethoxycatecholate], -   [2-methyl-3-propyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [2-methyl-3-propyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [2-methyl-3-propyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butylcatecholate], -   [2-methyl-3-propyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butyl-6-chlorocatecholate], -   [2-methyl-3-propyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butyl-6-nitrocatecholate], -   [2-methyl-3-propyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [2-methyl-3-propyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propylcatecholate], -   [2-methyl-3-propyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [1,4,6,8-tetra-tert-butyldibenzo[1,4]dioxine-2,3-diolate], -   [2-methyl-3-propyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [1,4,6,7,8,9-hexachlorodibenzo[1,4]dioxine-2,3-diolate], -   [2-methyl-3-propyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [1,4,6,7,8,9-hexabromodibenzo[1,4]dioxine-2,3-diolate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butylcatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butvl-4,5-dichlorocatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butyl-4-bromocatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butvl-4,5-dibromocatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butyl-4-fluorocatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butyl-4,5-difluorocatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butvl-4,5-dimethoxycatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butyl-4-ethoxycatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butvl-4,5-diethoxycatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butyl-4-propoxycatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butvl-4,5-dipropoxycatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butyl-4-butoxyoxycatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butvl-4,5-dibutoxycatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butyl-4,5-di-iso-propylcatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,5-di-tert-butylcatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,5-di-tert-butyl-6-chlorocatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,5-di-tert-butyl-6-bromocatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,5-di-tert-butyl-6-fluorocatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,5-di-tert-butyl-6-nitrocatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butylcatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butyl-4-chlorocatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butvl-4,5-dichlorocatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butyl-4-bromocatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butvl-4,5-dibromocatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butyl-4-fluorocatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butyl-4,5-difluorocatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butyl-4-methoxycatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butvl-4,5-dimethoxycatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butyl-4-ethoxycatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butvl-4,5-diethoxycatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butyl-4-propoxycatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butvl-4,5-dipropoxycatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butyl-4-butoxyoxycatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butvl-4,5-dibutoxycatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butyl-4-iso-propylcatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butyl-4,5-di-iso-propylcatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butyl-4-cyclohexylcatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,5-di-iso-butylcatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,5-di-iso-butyl-6-chlorocatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,5-di-iso-butyl-6-bromocatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,5-di-iso-butyl-6-fluorocatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,5-di-iso-butyl-6-nitrocatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propylcatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4-chlorocatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4,5-dichlorocatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4-bromocatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4,5-dibromocatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4-fluorocatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4,5-difluorocatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4-methoxycatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4,5-dimethoxycatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4-ethoxycatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4,5-diethoxycatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4-propoxycatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4,5-dipropoxycatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4-butoxycatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4,5-dibutoxycatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,4,5,6-tetra-iso-propylcatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4-cyclohexylcatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,5-di-iso-propylcatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,4,6-tri-n-propylcatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-n-propylcatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,5-di-n-propylcatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-dimethylcatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-dimethyl-4-chlorocatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-dimethyl-4,5-dichlorocatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-dimethyl-4-bromocatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-dimethyl-4,5-dibromocatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-dimethyl-4-fluorocatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-dimethyl-4,5-difluorocatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-dimethyl-4-methoxycatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-dimethyl-4,5-dimethoxycatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-dimethyl-4-ethoxycatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-dimethyl-4,5-diethoxycatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-dimethyl-4-propoxycatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-dimethyl-4,5-dipropoxycatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-dimethyl-4-butoxycatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-dimethyl-4,5-dibutoxycatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,5-dimethylcatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [1,4,6,8-tetra-tert-butyldibenzo[1,4]dioxine-2,3-diolate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [1,4,6,7,8,9-hexachlorodibenzo[1,4]dioxine-2,3-diolate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [1,4,6,7,8,9-hexabromodibenzo[1,4]dioxine-2,3-diolate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene][3,4,5,6-tetrachlorocatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene][3,4,5,6-tetrabromocatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene][3,4,5,6-tetrafluorocatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene][3,6-dichlorocatechlote], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene][4-methylcatecholate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene][naphthalene-2,3-diolate), -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene][phenanthrene-9,10-diolate], -   [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]catecholate, -   [1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butylcatecholate], -   [1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-dichlorocatecholate], -   [1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-fluorocatecholate], -   [1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4,5-difluorocatecholate], -   [1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate), -   [1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-dimethoxycatecholate), -   [1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butylcatecholate], -   [1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butyl-6-chlorocatecholate], -   [1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butyl-6-nitrocatecholate], -   [1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propylcatecholate], -   [1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-dimethylcatecholate], -   [1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [1,4,6,8-tetra-tert-butyldibenzo[1,4]dioxine-2,3-diolate], -   [1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [1,4,6,7,8,9-hexachlorodibenzo[1,4]dioxine-2,3-diolate], -   [1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [1,4,6,7,8,9-hexabromodibenzo[1,4]dioxine-2,3-diolate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butylcatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-dichlorocatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-bromocatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-dibromocatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-fluorocatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4,5-difluorocatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-dimethoxycatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-ethoxycatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-diethoxycatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-propoxycatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-dipropoxycatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-butoxyoxycatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-dibutoxycatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4,5-di-iso-propylcatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butylcatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butyl-6-chlorocatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butyl-6-bromocatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butyl-6-fluorocatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butyl-6-nitrocatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butylcatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-chlorocatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butvl-4,5-dichlorocatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-bromocatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butvl-4,5-dibromocatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-fluorocatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4,5-difluorocatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-methoxycatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butvl-4,5-dimethoxycatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-ethoxycatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butvl-4,5-diethoxycatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-propoxycatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butvl-4,5-dipropoxycatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-butoxyoxycatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butvl-4,5-dibutoxycatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-iso-propylcatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4,5-di-iso-propylcatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-butyl-4-cyclohexylcatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-iso-butylcatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-iso-butyl-6-chlorocatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-iso-butyl-6-bromocatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-iso-butyl-6-fluorocatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-iso-butyl-6-nitrocatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propylcatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4-chlorocatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4,5-dichlorocatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4-bromocatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4,5-dibromocatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4-fluorocatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4,5-difluorocatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4-methoxycatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4,5-dimethoxycatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4-ethoxycatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4,5-diethoxycatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4-propoxycatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4,5-dipropoxycatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4-butoxycatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4,5-dibutoxycatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,4,5,6-tetra-iso-propylcatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propyl-4-cyclohexylcatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-iso-propylcatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,4,6-tri-n-propylcatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-n-propylcatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-n-propylcatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethylcatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4-chlorocatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4,5-dichlorocatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4-bromocatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4,5-dibromocatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4-fluorocatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4,5-difluorocatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4-methoxycatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4,5-dimethoxycatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4-ethoxycatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4,5-diethoxycatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4-propoxycatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4,5-dipropoxycatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4-butoxycatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dimethyl-4,5-dibutoxycatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-dimethylcatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [1,4,6,8-tetra-tert-butyldibenzo[1,4]dioxine-2,3-diolate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [1,4,6,7,8,9-hexachlorodibenzo[1,4]dioxine-2,3-diolate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [1,4,6,7,8,9-hexabromodibenzo[1,4]dioxine-2,3-diolate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,4,5,6-tetrachlorocatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,4,5,6-tetrabromocatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,4,5,6-tetrafluorocatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-dichlorocatechlote], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [4-methylcatecholate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [naphthalene-2,3-diolate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [phenanthrene-9,10-diolate], -   [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     catecholate, -   [2-methyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butylcatecholate], -   [2-methyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-methyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-dichlorocatecholate], -   [2-methyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-fluorocatecholate], -   [2-methyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4,5-difluorocatecholate], -   [2-methyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-methyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-dimethoxycatecholate], -   [2-methyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [2-methyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [2-methyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butylcatecholate), -   [2-methyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butyl-6-chlorocatecholate], -   [2-methyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butyl-6-nitrocatecholate], -   [2-methyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [2-methyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propylcatecholate], -   [2-methyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [1,4,6,8-tetra-tert-butyldibenzo[1,4]dioxine-2,3-diolate], -   [2-methyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [1,4,6,7,8,9-hexachlorodibenzo[1,4]dioxine-2,3-diolate], -   [2-methyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [1,4,6,7,8,9-hexabromodibenzo[1,4]dioxine-2,3-diolate], -   [2-methyl-3-propyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butylcatecholate], -   [2-methyl-3-propyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-methyl-3-propyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-dichlorocatecholate], -   [2-methyl-3-propyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-fluorocatecholate], -   [2-methyl-3-propyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4,5-difluorocatecholate], -   [2-methyl-3-propyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-methyl-3-propyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butvl-4,5-dimethoxycatecholate], -   [2-methyl-3-propyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [2-methyl-3-propyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [2-methyl-3-propyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butylcatecholate], -   [2-methyl-3-propyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butyl-6-chlorocatecholate], -   [2-methyl-3-propyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,5-di-tert-butyl-6-nitrocatecholate], -   [2-methyl-3-propyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [2-methyl-3-propyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [3,6-di-iso-propylcatecholate], -   [2-methyl-3-propyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [1,4,6,8-tetra-tert-butyldibenzo[1,4]dioxine-2,3-diolate], -   [2-methyl-3-propyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [1,4,6,7,8,9-hexachlorodibenzo[1,4]dioxine-2,3-diolate], -   [2-methyl-3-propyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II)     [1,4,6,7,8,9-hexabromodibenzo[1,4]dioxine-2,3-diolate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butylcatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butvl-4,5-dichlorocatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butyl-4-bromocatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butvl-4,5-dibromocatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butyl-4-fluorocatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butyl-4,5-difluorocatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butvl-4,5-dimethoxycatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butyl-4-ethoxycatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butvl-4,5-diethoxycatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butyl-4-propoxycatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butvl-4,5-dipropoxycatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butyl-4-butoxyoxycatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butvl-4,5-dibutoxycatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butyl-4,5-di-iso-propylcatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,5-di-tert-butylcatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,5-di-tert-butyl-6-chlorocatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,5-di-tert-butyl-6-bromocatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,5-di-tert-butyl-6-fluorocatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,5-di-tert-butyl-6-nitrocatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butylcatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butyl-4-chlorocatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butvl-4,5-dichlorocatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butyl-4-bromocatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butvl-4,5-dibromocatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butyl-4-fluorocatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butyl-4,5-difluorocatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butyl-4-methoxycatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butvl-4,5-dimethoxycatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butyl-4-ethoxycatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butvl-4,5-diethoxycatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butyl-4-propoxycatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butvl-4,5-dipropoxycatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butyl-4-butoxyoxycatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butvl-4,5-dibutoxycatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butyl-4-iso-propylcatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butyl-4,5-di-iso-propylcatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-butyl-4-cyclohexylcatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,5-di-iso-butylcatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,5-di-iso-butyl-6-chlorocatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,5-di-iso-butyl-6-bromocatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,5-di-iso-butyl-6-fluorocatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,5-di-iso-butyl-6-nitrocatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propylcatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4-chlorocatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4,5-dichlorocatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4-bromocatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4,5-dibromocatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4-fluorocatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4,5-difluorocatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4-methoxycatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4,5-dimethoxycatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4-ethoxycatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4,5-diethoxycatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4-propoxycatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4,5-dipropoxycatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4-butoxycatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4,5-dibutoxycatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,4,5,6-tetra-iso-propylcatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-iso-propyl-4-cyclohexylcatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,5-di-iso-propylcatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,4,6-tri-n-propylcatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-di-n-propylcatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,5-di-n-propylcatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-dimethylcatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-dimethyl-4-chlorocatecholate), -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-dimethyl-4,5-dichlorocatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-dimethyl-4-bromocatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-dimethyl-4,5-dibromocatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-dimethyl-4-fluorocatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-dimethyl-4,5-difluorocatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-dimethyl-4-methoxycatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-dimethyl-4,5-dimethoxycatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-dimethyl-4-ethoxycatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-dimethyl-4,5-diethoxycatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-dimethyl-4-propoxycatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-dimethyl-4,5-dipropoxycatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-dimethyl-4-butoxycatecholate), -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-dimethyl-4,5-dibutoxycatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,5-dimethylcatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [1,4,6,8-tetra-tert-butyldibenzo[1,4]dioxine-2,3-diolate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [1,4,6,7,8,9-hexachlorodibenzo[1,4]dioxine-2,3-diolate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [1,4,6,7,8,9-hexabromodibenzo[1,4]dioxine-2,3-diolate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,4,5,6-tetrachlorocatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,4,5,6-tetrabromocatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,4,5,6-tetrafluorocatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [3,6-dichlorocatechlote], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [4-methylcatecholate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [naphthalene-2,3-diolate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     [phenanthrene-9,10-diolate], -   [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II)     catecholate, -   [1,2-bis-(2,6-dimethylphenylimino)-cyclohexane]nickel(II)     [3,6-di-tert-butylcatecholate], -   [2,3-bis-(2,6-dimethylphenylimino)-[1,4]dithiane]nickel(II)     [3,6-di-tert-butylcatecholate], -   [2,3-bis-(2,6-dimethylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butylcatecholate], -   [1,4-dimethyl-2,3-bis-(2,6-dimethylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butylcatecholate], -   [2,3-bis-(2,6-dimethylphenylimino)-bicyclo[2.2.1]-heptane]nickel(II)     [3,6-di-tert-butylcatecholate], -   [1,4-dimethyl-2,3-bis-(2,6-dimethylphenylimino)-[1,4]diazepane]nickel(II)     [3,6-di-tert-butylcatecholate], -   [1-methyl-2,3-bis-(2,6-dimethylphenylimino)-cyclopentane]nickel(II)     [3,6-di-tert-butylcatecholate], -   [5-methyl-2,3-bis-(2,6-dimethylphenylimino)-tetrahydrofuran]nickel(II)     [3,6-di-tert-butylcatecholate], -   [5-methyl-2,3-bis-(2,6-dimethylphenylimino)-2,3-dihydrohydrofuran]nickel(II)     [3,6-di-tert-butylcatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)-cyclohexane]nickel(II)     [3,6-di-tert-butylcatecholate], -   [2,3-bis-(2,6-di-iso-propylphenylimino)-[1,4]dithiane]nickel(II)     [3,6-di-tert-butylcatecholate], -   [2,3-bis-(2,6-di-iso-propylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butylcatecholate], -   [1,4-dimethyl-2,3-bis-(2,6-di-iso-propylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butylcatecholate], -   [2,3-bis-(2,6-di-iso-propylphenylimino)-bicyclo[2.2.1]-heptane]nickel(II)     [3,6-di-tert-butylcatecholate], -   [1,4-dimethyl-2,3-bis-(2,6-di-iso-propylphenylimino)-[1,4]diazepane]nickel(II)     [3,6-di-tert-butylcatecholate], -   [1-methyl-2,3-bis-(2,6-di-iso-propylphenylimino)-cyclopentane]nickel(II)     [3,6-di-tert-butylcatecholate], -   [5-methyl-2,3-bis-(2,6-di-iso-propylphenylimino)-tetrahydrofuran]nickel(II)     [3,6-di-tert-butylcatecholate], -   [5-methyl-2,3-bis-(2,6-di-iso-propylphenylimino)-2,3-dihydrohydrofuran]nickel(II)     [3,6-di-tert-butylcatecholate], -   [1-(2,6-di-iso-propylphenylimino)-2-(2,6-dimethylphenylimino)-cyclohexane]nickel(II)     [3,6-di-tert-butylcatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-[1,4]dithiane]nickel(II)     [3,6-di-tert-butylcatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butylcatecholate], -   [1,4-dimethyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butylcatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-bicyclo[2.2.1]-heptane]nickel(II)     [3,6-di-tert-butylcatecholate], -   [1,4-dimethyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-[1,4]diazepane]nickel(II)     [3,6-di-tert-butylcatecholate],     [1-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-cyclopentane]nickel(II)     [3,6-di-tert-butylcatecholate], -   [5-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-tetrahydrofuran]nickel(II)     [3,6-di-tert-butylcatecholate], -   [5-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-2,3-dihydrohydrofuran]nickel(II)     [3,6-di-tert-butylcatecholate], -   [1-(2,6-di-iso-propylphenylimino)-2-(2,5-di-tert-butylphenylimino)-cyclohexane]nickel(II)     [3,6-di-tert-butylcatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-[1,4]dithiane]nickel(II)     [3,6-di-tert-butylcatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butylcatecholate], -   [1,4-dimethyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butylcatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-bicyclo[2.2.1]-heptane]nickel(II)     [3,6-di-tert-butylcatecholate], -   [1,4-dimethyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-[1,4]diazepane]nickel(II)     [3,6-di-tert-butylcatecholate], -   [1-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-cyclopentane]nickel(II)     [3,6-di-tert-butylcatecholate], -   [5-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-tetrahydrofuran]nickel(II)     [3,6-di-tert-butylcatecholate], -   [5-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-2,3-dihydrohydrofuran]nickel(II)     [3,6-di-tert-butylcatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)-cyclohexane]nickel(II)     [3,5-di-tert-butylcatecholate], -   [2,3-bis-(2,6-dimethylphenylimino)-[1,4]dithiane]nickel(II)     [3,5-di-tert-butylcatecholate], -   [2,3-bis-(2,6-dimethylphenylimino)-piperazine]nickel(II)     [3,5-di-tert-butylcatecholate], -   [1,4-dimethyl-2,3-bis-(2,6-dimethylphenylimino)-piperazine]nickel(II)     [3,5-di-tert-butylcatecholate], -   [2,3-bis-(2,6-dimethylphenylimino)-bicyclo[2.2.1]-heptane]nickel(II)     [3,5-di-tert-butylcatecholate], -   [1,4-dimethyl-2,3-bis-(2,6-dimethylphenylimino)-[1,4]diazepane]nickel(II)     [3,5-di-tert-butylcatecholate], -   [1-methyl-2,3-bis-(2,6-dimethylphenylimino)-cyclopentane]nickel(II)     [3,5-di-tert-butylcatecholate], -   [5-methyl-2,3-bis-(2,6-dimethylphenylimino)-tetrahydrofuran]nickel(II)     [3,5-di-tert-butylcatecholate], -   [5-methyl-2,3-bis-(2,6-dimethylphenylimino)-2,3-dihydrohydrofuran]nickel(II)     [3,5-di-tert-butylcatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)-cyclohexane]nickel(II)     [3,5-di-tert-butylcatecholate], -   [2,3-bis-(2,6-di-iso-propylphenylimino)-[1,4]dithiane]nickel(II)     [3,5-di-tert-butylcatecholate], -   [2,3-bis-(2,6-di-iso-propylphenylimino)-piperazine]nickel(II)     [3,5-di-tert-butylcatecholate], -   [1,4-dimethyl-2,3-bis-(2,6-di-iso-propylphenylimino)-piperazine]nickel(II)     [3,5-di-tert-butylcatecholate], -   [2,3-bis-(2,6-di-iso-propylphenylimino)-bicyclo[2.2.1]-heptane]nickel(II)     [3,5-di-tert-butylcatecholate], -   [1,4-dimethyl-2,3-bis-(2,6-di-iso-propylphenylimino)-[1,4]diazepane]nickel(II)     [3,5-di-tert-butylcatecholate], -   [1-methyl-2,3-bis-(2,6-di-iso-propylphenylimino)-cyclopentane]nickel(II)     [3,5-di-tert-butylcatecholate], -   [5-methyl-2,3-bis-(2,6-di-iso-propylphenylimino)-tetrahydrofuran]nickel(II)     [3,5-di-tert-butylcatecholate], -   [5-methyl-2,3-bis-(2,6-di-iso-propylphenylimino)-2,3-dihydrohydrofuran]nickel(II)     [3,5-di-tert-butylcatecholate], -   [1-(2,6-di-iso-propylphenylimino)-2-(2,6-dimethylphenylimino)-cyclohexane]nickel(II)     [3,5-di-tert-butylcatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-[1,4]dithiane]nickel(II)     [3,5-di-tert-butylcatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-piperazine]nickel(II)     [3,5-di-tert-butylcatecholate], -   [1,4-dimethyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-piperazine]nickel(II)     [3,5-di-tert-butylcatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-bicyclo[2.2.1]-heptane]nickel(II)     [3,5-di-tert-butylcatecholate], -   [1,4-dimethyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-[1,4]diazepane]nickel(II)     [3,5-di-tert-butylcatecholate], -   [1-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-cyclopentane]nickel(II)     [3,5-di-tert-butylcatecholate], -   [5-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-tetrahydrofuran]nickel(II)     [3,5-di-tert-butylcatecholate], -   [5-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-2,3-dihydrohydrofuran]nickel(II)     [3,5-di-tert-butylcatecholate], -   [1-(2,6-di-iso-propylphenylimino)-2-(2,5-di-tert-butylphenylimino)-cyclohexane]nickel(II)     [3,5-di-tert-butylcatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-[1,4]dithiane]nickel(II)     [3,5-di-tert-butylcatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-piperazine]nickel(II)     [3,5-di-tert-butylcatecholate], -   [1,4-dimethyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-piperazine]nickel(II)     [3,5-di-tert-butylcatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-bicyclo[2.2.1]-heptane]nickel(II)     [3,5-di-tert-butylcatecholate], -   [1,4-dimethyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-[1,4]diazepane]nickel(II)     [3,5-di-tert-butylcatecholate], -   [1-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-cyclopentane]nickel(II)     [3,5-di-tert-butylcatecholate], -   [5-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-tetrahydrofuran]nickel(II)     [3,5-di-tert-butylcatecholate], -   [5-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-2,3-dihydrohydrofuran]nickel(II)     [3,5-di-tert-butylcatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)-cyclohexane]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2,3-bis-(2,6-dimethylphenylimino)-[1,4]dithiane]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2,3-bis-(2,6-dimethylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [1,4-dimethyl-2,3-bis-(2,6-dimethylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   (2,3-bis-(2,6-dimethylphenylimino)-bicyclo[2.2.1]-heptane]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [1,4-dimethyl-2,3-bis-(2,6-dimethylphenylimino)-[1,4]diazepane]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [1-methyl-2,3-bis-(2,6-dimethylphenylimino)-cyclopentane]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [5-methyl-2,3-bis-(2,6-dimethylphenylimino)-tetrahydrofuran]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [5-methyl-2,3-bis-(2,6-dimethylphenylimino)-2,3-dihydrohydrofuran]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)-cyclohexane]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2,3-bis-(2,6-di-iso-propylphenylimino)-[1,4]dithiane]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2,3-bis-(2,6-di-iso-propylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [1,4-dimethyl-2,3-bis-(2,6-di-iso-propylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2,3-bis-(2,6-di-iso-propylphenylimino)-bicyclo[2.2.1]-heptane]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [1,4-dimethyl-2,3-bis-(2,6-di-iso-propylphenylimino)-[1,4]diazepane]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [1-methyl-2,3-bis-(2,6-di-iso-propylphenylimino)-cyclopentane]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [5-methyl-2,3-bis-(2,6-di-iso-propylphenylimino)-tetrahydrofuran]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [5-methyl-2,3-bis-(2,6-di-iso-propylphenylimino)-2,3-dihydrohydrofuran]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [1-(2,6-di-iso-propylphenylimino)-2-(2,6-dimethylphenylimino)-cyclohexane]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-[1,4]dithiane]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [1,4-dimethyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-bicyclo[2.2.1]-heptane]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [1,4-dimethyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-[1,4]diazepane]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [1-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-cyclopentane]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [5-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-tetrahydrofuran]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [5-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-2,3-dihydrohydrofuran]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [1-(2,6-di-iso-propylphenylimino)-2-(2,5-di-tert-butylphenylimino)-cyclohexane]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-[1,4]dithiane)     nickel(II) [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [1,4-dimethyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-bicyclo[2.2.1]-heptane]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [1,4-dimethyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-[1,4]diazepane]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [1-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-cyclopentane]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [5-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-tetrahydrofuran]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [5-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-2,3-dihydrohydrofuran]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)-cyclohexane]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2,3-bis-(2,6-dimethylphenylimino)-[1,4]dithiane]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2,3-bis-(2,6-dimethylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [1,4-dimethyl-2,3-bis-(2,6-dimethylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2,3-bis-(2,6-dimethylphenylimino)-bicyclo[2.2.1]-heptane]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [1,4-dimethyl-2,3-bis-(2,6-dimethylphenylimino)-[1,4]diazepane]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [1-methyl-2,3-bis-(2,6-dimethylphenylimino)-cyclopentane]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate), -   [5-methyl-2,3-bis-(2,6-dimethylphenylimino)-tetrahydrofuran]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatechol ate], -   [5-methyl-2,3-bis-(2,6-dimethylphenylimino)-2,3-dihydrohydrofuran]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)-cyclohexane]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2,3-bis-(2,6-di-iso-propylphenylimino)-[1,4]dithiane]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2,3-bis-(2,6-di-iso-propylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [1,4-dimethyl-2,3-bis-(2,6-di-iso-propylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2,3-bis-(2,6-di-iso-propylphenylimino)-bicyclo[2.2.1]-heptane]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [1,4-dimethyl-2,3-bis-(2,6-di-iso-propylphenylimino)-[1,4]diazepane]     nickel(II) [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [1-methyl-2,3-bis-(2,6-di-iso-propylphenylimino)-cyclopentane]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [5-methyl-2,3-bis-(2,6-di-iso-propylphenylimino)-tetrahydrofuran]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [5-methyl-2,3-bis-(2,6-di-iso-propylphenylimino)-2,3-dihydrohydrofuran]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [1-(2,6-di-iso-propylphenylimino)-2-(2,6-dimethylphenylimino)-cyclohexane]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-[1,4]dithiane]nickel(II)     (3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [1,4-dimethyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-bicyclo[2.2.1]-heptane]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [1,4-dimethyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-[1,4]diazepane]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [1-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-cyclopentane]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [5-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-tetrahydrofuran]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [5-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-2,3-dihydrohydrofuran]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [1-(2,6-di-iso-propylphenylimino)-2-(2,5-di-tert-butylphenylimino)-cyclohexane]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-[1,4]dithiane]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [1,4-dimethyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-bicyclo[2.2.1]-heptane]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [1,4-dimethyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-[1,4]diazepane]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [1-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-cyclopentane     nickel(II) [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [5-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-tetrahydrofuran]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [5-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-2,3-dihydrohydrofuran]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)-cyclohexane]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2,3-bis-(2,6-dimethylphenylimino)-[1,4]dithiane]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2,3-bis-(2,6-dimethylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [1,4-dimethyl-2,3-bis-(2,6-dimethylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2,3-bis-(2,6-dimethylphenylimino)-bicyclo[2.2.1]-heptane]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [1,4-dimethyl-2,3-bis-(2,6-dimethylphenylimino)-[1,4]diazepane]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [1-methyl-2,3-bis-(2,6-dimethylphenylimino)-cyclopentane]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [5-methyl-2,3-bis-(2,6-dimethylphenylimino)-tetrahydrofuran]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [5-methyl-2,3-bis-(2,6-dimethylphenylimino)-2,3-dihydrohydrofuran]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)-cyclohexane]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2,3-bis-(2,6-di-iso-propylphenylimino)-[1,4]dithiane]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2,3-bis-(2,6-di-iso-propylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [1,4-dimethyl-2,3-bis-(2,6-di-iso-propylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2,3-bis-(2,6-di-iso-propylphenylimino)-bicyclo[2.2.1]-heptane]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [1,4-dimethyl-2,3-bis-(2,6-di-iso-propylphenylimino)-[1,4]diazepane]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [1-methyl-2,3-bis-(2,6-di-iso-propylphenylimino)-cyclopentane]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [5-methyl-2,3-bis-(2,6-di-iso-propylphenylimino)-tetrahydrofuran]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [5-methyl-2,3-bis-(2,6-di-iso-propylphenylimino)-2,3-dihydrohydrofuran]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [1-(2,6-di-iso-propylphenylimino)-2-(2,6-dimethylphenylimino)-cyclohexane]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-[1,4]dithiane]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [1,4-dimethyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-bicyclo[2.2.1]-heptane]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [1,4-dimethyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-[1,4]diazepane]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [1-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-cyclopentane]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [5-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-tetrahydrofuran]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [5-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-2,3-dihydrohydrofuran]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate), -   [1-(2,6-di-iso-propylphenylimino)-2-(2,5-di-tert-butylphenylimino)-cyclohexane]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-[1,4]dithiane)     nickel(II) [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [1,4-dimethyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-piperazine     nickel(II) [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-bicyclo[2.2.1]-heptane]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [1,4-dimethyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-[1,4]diazepane]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [1-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-cyclopentane]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [5-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-tetrahydrofuran]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [5-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-2,3-dihydrohydrofuran]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)-cyclohexane]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2,3-bis-(2,6-dimethylphenylimino)-[1,4]dithiane]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2,3-bis-(2,6-dimethylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [1,4-dimethyl-2,3-bis-(2,6-dimethylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2,3-bis-(2,6-dimethylphenylimino)-bicyclo[2.2.1]-heptane]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [1,4-dimethyl-2,3-bis-(2,6-dimethylphenylimino)-[1,4]diazepane]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [1-methyl-2,3-bis-(2,6-dimethylphenylimino)-cyclopentane]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [5-methyl-2,3-bis-(2,6-dimethylphenylimino)-tetrahydrofuran]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [5-methyl-2,3-bis-(2,6-dimethylphenylimino)-2,3-dihydrohydrofuran]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)-cyclohexane]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2,3-bis-(2,6-di-iso-propylphenylimino)-[1,4]dithiane]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2,3-bis-(2,6-di-iso-propylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [1,4-dimethyl-2,3-bis-(2,6-di-iso-propylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2,3-bis-(2,6-di-iso-propylphenylimino)-bicyclo[2.2.1]-heptane]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [1,4-dimethyl-2,3-bis-(2,6-di-iso-propylphenylimino)-[1,4]diazepane]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [1-methyl-2,3-bis-(2,6-di-iso-propylphenylimino)-cyclopentane]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [5-methyl-2,3-bis-(2,6-di-iso-propylphenylimino)-tetrahydrofuran]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [5-methyl-2,3-bis-(2,6-di-iso-propylphenylimino)-2,3-dihydrohydrofuran]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [1-(2,6-di-iso-propylphenylimino)-2-(2,6-dimethylphenylimino)-cyclohexane     nickel(II) [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-[1,4]dithiane]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [1,4-dimethyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-bicyclo[2.2.1]-heptane]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [1,4-dimethyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-[1,4]diazepane]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [1-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-cyclopentane]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [5-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-tetrahydrofuran]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [5-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-2,3-dihydrohydrofuran]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [1-(2,6-di-iso-propylphenylimino)-2-(2,5-di-tert-butylphenylimino)-cyclohexane]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-[1,4]dithiane]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [1,4-dimethyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-bicyclo[2.2.1]-heptane]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [1,4-dimethyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-[1,4]diazepane]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [1-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-cyclopentane]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [5-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-tetrahydrofuran]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [5-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-2,3-dihydrohydrofuran]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)-cyclohexane]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [2,3-bis-(2,6-dimethylphenylimino)-[1,4]dithiane]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [2,3-bis-(2,6-dimethylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [1,4-dimethyl-2,3-bis-(2,6-dimethylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [2,3-bis-(2,6-dimethylphenylimino)-bicyclo[2.2.1]-heptane]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [1,4-dimethyl-2,3-bis-(2,6-dimethylphenylimino)-[1,4]diazepane]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [1-methyl-2,3-bis-(2,6-dimethylphenylimino)-cyclopentane]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [5-methyl-2,3-bis-(2,6-dimethylphenylimino)-tetrahydrofuran]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [5-methyl-2,3-bis-(2,6-dimethylphenylimino)-2,3-dihydrohydrofuran]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)-cyclohexane]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate), -   [2,3-bis-(2,6-di-iso-propylphenylimino)-[1,4]dithiane]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [2,3-bis-(2,6-di-iso-propylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [1,4-dimethyl-2,3-bis-(2,6-di-iso-propylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [2,3-bis-(2,6-di-iso-propylphenylimino)-bicyclo[2.2.1-heptane]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [1,4-dimethyl-2,3-bis-(2,6-di-iso-propylphenylimino)-[1,4]diazepane]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [1-methyl-2,3-bis-(2,6-di-iso-propylphenylimino)-cyclopentane]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [5-methyl-2,3-bis-(2,6-di-iso-propylphenylimino)-tetrahydrofuran]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [5-methyl-2,3-bis-(2,6-di-iso-propylphenylimino)-2,3-dihydrohydrofuran]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [1-(2,6-di-iso-propylphenylimino)-2-(2,6-dimethylphenylimino)-cyclohexane]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-[1,4]dithiane)     nickel(II) [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [1,4-dimethyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-bicyclo[2.2.2.1]-heptane]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [1,4-dimethyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-[1,4]diazepane]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [1-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-cyclopentane]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [5-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-tetrahydrofuran]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [5-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-2,3-dihydrohydrofuran]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [1-(2,6-di-iso-propylphenylimino)-2-(2,5-di-tert-butylphenylimino)-cyclohexane]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-[1,4]dithiane]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [1,4-dimethyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-bicyclo[2.2.1]-heptane]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [1,4-dimethyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-[1,4]diazepane]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [1-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-cyclopentane]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [5-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-tetrahydrofuran]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [5-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-2,3-dihydrohydrofuran]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)-cyclohexane]nickel(II)     [3,6-di-tert-butyl-4,5-di-iso-propylcatecholate], -   [2,3-bis-(2,6-dimethylphenylimino)-[1,4]dithiane]nickel(II)     [3,6-di-tert-butyl-4,5-di-iso-propylcatecholate], -   [2,3-bis-(2,6-dimethylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butyl-4,5-di-iso-propylcatecholate], -   [1,4-dimethyl-2,3-bis-(2,6-dimethylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butyl-4,5-di-iso-propylcatecholate], -   [2,3-bis-(2,6-dimethylphenylimino)-bicyclo[2.2.1]-heptane]nickel(II)     [3,6-di-tert-butyl-4,5-di-iso-propylcatecholate], -   [1,4-dimethyl-2,3-bis-(2,6-dimethylphenylimino)-[1,4]diazepane]nickel(II)     [3,6-di-tert-butyl-4,5-di-iso-propylcatecholate], -   [1-methyl-2,3-bis-(2,6-dimethylphenylimino)-cyclopentane]nickel(II)     [3,6-di-tert-butyl-4,5-di-iso-propylcatecholate], -   [5-methyl-2,3-bis-(2,6-dimethylphenylimino)-tetrahydrofuran]nickel(II)     [3,6-di-tert-butyl-4,5-di-iso-propylcatecholate], -   [5-methyl-2,3-bis-(2,6-dimethylphenylimino)-2,3-dihydrohydrofuran]nickel(II)     [3,6-di-tert-butyl-4,5-di-iso-propylcatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)-cyclohexane]nickel(II)     [3,6-di-tert-butyl-4,5-di-iso-propylcatecholate], -   [2,3-bis-(2,6-di-iso-propylphenylimino)-[1,4]dithiane]nickel(II)     [3,6-di-tert-butyl-4,5-di-iso-propylcatecholate], -   [2,3-bis-(2,6-di-iso-propylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butyl-4,5-di-iso-propylcatecholate], -   [1,4-dimethyl-2,3-bis-(2,6-di-iso-propylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butyl-4,5-di-iso-propylcatecholate], -   [2,3-bis-(2,6-di-iso-propylphenylimino)-bicyclo[2.2.1]-heptane]nickel(II)     [3,6-di-tert-butyl-4,5-di-iso-propylcatecholate], -   [1,4-dimethyl-2,3-bis-(2,6-di-iso-propylphenylimino)-[1,4]diazepane]nickel(II)     [3,6-di-tert-butyl-4,5-di-iso-propylcatecholate], -   [1-methyl-2,3-bis-(2,6-di-iso-propylphenylimino)-cyclopentane]nickel(II)     [3,6-di-tert-butyl-4,5-di-iso-propylcatecholate], -   [5-methyl-2,3-bis-(2,6-di-iso-propylphenylimino)-tetrahydrofuran]nickel(II)     [3,6-di-tert-butyl-4,5-di-iso-propylcatecholate], -   [5-methyl-2,3-bis-(2,6-di-iso-propylphenylimino)-2,3-dihydrohydrofuran]nickel(II)     [3,6-di-tert-butyl-4,5-di-iso-propylcatecholate], -   [1-(2,6-di-iso-propylphenylimino)-2-(2,6-dimethylphenylimino)-cyclohexane]nickel(II)     [3,6-di-tert-butyl-4,5-di-iso-propylcatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-[1,4]dithiane]nickel(II)     [3,6-di-tert-butyl-4,5-di-iso-propylcatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butyl-4,5-di-iso-propylcatecholate], -   [1,4-dimethyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butyl-4,5-di-iso-propylcatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-bicyclo[2.2.1]-heptane]nickel(II)     [3,6-di-tert-butyl-4,5-di-iso-propylcatecholate], -   [1,4-dimethyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-[1,4]diazepane]nickel(II)     [3,6-di-tert-butyl-4,5-di-iso-propylcatecholate], -   [1-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-cyclopentane]nickel(II)     [3,6-di-tert-butyl-4,5-di-iso-propylcatecholate], -   [5-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-tetrahydrofuran]nickel(II)     [3,6-di-tert-butyl-4,5-di-iso-propylcatecholate], -   [5-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-2,3-dihydrohydrofuran]nickel(II)     [3,6-di-tert-butyl-4,5-di-iso-propylcatecholate], -   [1-(2,6-di-iso-propylphenylimino)-2-(2,5-di-tert-butylphenylimino)-cyclohexane]nickel(II)     [3,6-di-tert-butyl-4,5-di-iso-propylcatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-[1,4]dithiane]nickel(II)     [3,6-di-tert-butyl-4,5-di-iso-propylcatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butyl-4,5-di-iso-propylcatecholate], -   [1,4-dimethyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butyl-4,5-di-iso-propylcatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-bicyclo[2.2.1]-heptane]nickel(II)     [3,6-di-tert-butyl-4,5-di-iso-propylcatecholate], -   [1,4-dimethyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-[1,4]diazepane]nickel(II)     [3,6-di-tert-butyl-4,5-di-iso-propylcatecholate], -   [1-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-cyclopentane]nickel(II)     [3,6-di-tert-butyl-4,5-di-iso-propylcatecholate], -   [5-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-tetrahydrofuran]nickel(II)     [3,6-di-tert-butyl-4,5-di-iso-propylcatecholate], -   [5-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-2,3-dihydrohydrofuran]nickel(II)     [3,6-di-tert-butyl-4,5-di-iso-propylcatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)-cyclohexane]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [2,3-bis-(2,6-dimethylphenylimino)-[1,4]dithiane]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [2,3-bis-(2,6-dimethylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [1,4-dimethyl-2,3-bis-(2,6-dimethylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [2,3-bis-(2,6-dimethylphenylimino)-bicyclo[2.2.1]heptane]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [1,4-dimethyl-2,3-bis-(2,6-dimethylphenylimino)-[1,4]diazepane]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [1-methyl-2,3-bis-(2,6-dimethylphenylimino)-cyclopentane]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [5-methyl-2,3-bis-(2,6-dimethylphenylimino)-tetrahydrofuran]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [5-methyl-2,3-bis-(2,6-dimethylphenylimino)-2,3-dihydrohydrofuran]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)-cyclohexane]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [2,3-bis-(2,6-di-iso-propylphenylimino)-[1,4]dithiane]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [2,3-bis-(2,6-di-iso-propylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [1,4-dimethyl-2,3-bis-(2,6-di-iso-propylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [2,3-bis-(2,6-di-iso-propylphenylimino)-bicyclo[2.2.1]-heptane]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [1,4-dimethyl-2,3-bis-(2,6-di-iso-propylphenylimino)-[1,4]diazepane]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [1-methyl-2,3-bis-(2,6-di-iso-propylphenylimino)-cyclopentane]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [5-methyl-2,3-bis-(2,6-di-iso-propylphenylimino)-tetrahydrofuran]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [5-methyl-2,3-bis-(2,6-di-iso-propylphenylimino)-2,3-dihydrohydrofuran]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [1-(2,6-di-iso-propylphenylimino)-2-(2,6-dimethylphenylimino)-cyclohexane]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-[1,4]dithiane]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-piperazine]nickel(I)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [1,4-dimethyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-bicyclo[2.2.1]-heptane]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [1,4-dimethyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-[1,4]diazepane]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [1-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-cyclopentane]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [5-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-tetrahydrofuran]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [5-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-2,3-dihydrohydrofuran]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [1-(2,6-di-iso-propylphenylimino)-2-(2,5-di-tert-butylphenylimino)-cyclobexane]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-[1,4]dithiane]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [1,4-dimethyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-piperazine]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-bicyclo[2.2.1-heptane]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [1,4-dimethyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-[1,4]diazepane]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [1-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-cyclopentane]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [5-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-tetrahydrofuran]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [5-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-2,3-dihydrohydrofuran]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)-cyclohexane]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [2,3-bis-(2,6-dimethylphenylimino)-[1,4]dithiane]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [2,3-bis-(2,6-dimethylphenylimino)-piperazine]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [1,4-dimethyl-2,3-bis-(2,6-dimethylphenylimino)-piperazine]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [2,3-bis-(2,6-dimethylphenylimino)-bicyclo[2.2.1]-heptane]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [1,4-dimethyl-2,3-bis-(2,6-dimethylphenylimino)-[1,4]diazepane]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [1-methyl-2,3-bis-(2,6-dimethylphenylimino)-cyclopentane]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [5-methyl-2,3-bis-(2,6-dimethylphenylimino)-tetrahydrofuran]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [5-methyl-2,3-bis-(2,6-dimethylphenylimino)-2,3-dihydrohydrofuran]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)-cyclohexane]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [2,3-bis-(2,6-di-iso-propylphenylimino)-[1,4]dithiane]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [2,3-bis-(2,6-di-iso-propylphenylimino)-piperazine]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [1,4-dimethyl-2,3-bis-(2,6-di-iso-propylphenylimino)-piperazine]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [2,3-bis-(2,6-di-iso-propylphenylimino)-bicyclo[2.2.1]-heptane]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [1,4-dimethyl-2,3-bis-(2,6-di-iso-propylphenylimino)-[1,4]diazepane]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [1-methyl-2,3-bis-(2,6-di-iso-propylphenylimino)-cyclopentane]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [5-methyl-2,3-bis-(2,6-di-iso-propylphenylimino)-tetrahydrofuran]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [5-methyl-2,3-bis-(2,6-di-iso-propylphenylimino)-2,3-dihydrohydrofuran]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [1-(2,6-di-iso-propylphenylimino)-2-(2,6-dimethylphenylimino)-cyclohexane]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-[1,4]dithiane]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-piperazine]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [1,4-dimethyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-piperazine]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-bicyclo[2.2.1]-heptane]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [1,4-dimethyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-[1,4]diazepane]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [1-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-cyclopentane]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [5-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-tetrahydrofuran]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [5-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-2,3-dihydrohydrofuran]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [1-(2,6-di-iso-propylphenylimino)-2-(2,5-di-tert-butylphenylimino)-cyclohexane]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-[1,4]dithiane]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-piperazine]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [1,4-dimethyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-piperazine]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-bicyclo[2.2.1]-heptane]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [1,4-dimethyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-[1,4]diazepane]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [1-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-cyclopentane]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [5-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-tetrahydrofuran]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [5-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-2,3-dihydrohydrofuran]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [1,2-bis-(2,6-dimethylphenylimino)-cyclohexane]nickel(II)     [3,6-di-iso-propylcatecholate], -   [2,3-bis-(2,6-dimethylphenylimino)-[1,4]dithiane]nickel(II)     [3,6-di-iso-propylcatecholate], -   [2,3-bis-(2,6-dimethylphenylimino)-piperazine]nickel(II)     [3,6-di-iso-propylcatecholate], -   [1,4-dimethyl-2,3-bis-(2,6-dimethylphenylimino)-piperazine]nickel(II)     [3,6-di-iso-propylcatecholate], -   [2,3-bis-(2,6-dimethylphenylimino)-bicyclo[2.2.1]-heptane]nickel(II)     [3,6-di-iso-propylcatecholate], -   [1,4-dimethyl-2,3-bis-(2,6-dimethylphenylimino)-[1,4]diazepane]nickel(II)     [3,6-di-iso-propylcatecholate], -   [1-methyl-2,3-bis-(2,6-dimethylphenylimino)-cyclopentane]nickel(II)     [3,6-di-iso-propylcatecholate], -   [5-methyl-2,3-bis-(2,6-dimethylphenylimino)-tetrahydrofuran]nickel(II)     [3,6-di-iso-propylcatecholate], -   [5-methyl-2,3-bis-(2,6-dimethylphenylimino)-2,3-dihydrohydrofuran]nickel(II)     [3,6-di-iso-propylcatecholate], -   [1,2-bis-(2,6-di-iso-propylphenylimino)-cyclohexane]nickel(II)     [3,6-di-iso-propylcatecholate], -   [2,3-bis-(2,6-di-iso-propylphenylimino)-[1,4]dithiane]nickel(II)     [3,6-di-iso-propylcatecholate], -   [2,3-bis-(2,6-di-iso-propylphenylimino)-piperazine]nickel(II)     [3,6-di-iso-propylcatecholate], -   [1,4-dimethyl-2,3-bis-(2,6-di-iso-propylphenylimino)-piperazine]nickel(II)     [3,6-di-iso-propylcatecholate], -   [2,3-bis-(2,6-di-iso-propylphenylimino)-bicyclo[2.2.1]-heptane]nickel(II)     [3,6-di-iso-propylcatecholate], -   [1,4-dimethyl-2,3-bis-(2,6-di-iso-propylphenylimino)-[1,4]diazepane]nickel(II)     [3,6-di-iso-propylcatecholate], -   [1-methyl-2,3-bis-(2,6-di-iso-propylphenylimino)-cyclopentane]nickel(II)     [3,6-di-iso-propylcatecholate], -   [5-methyl-2,3-bis-(2,6-di-iso-propylphenylimino)-tetrahydrofuran]nickel(II)     [3,6-di-iso-propylcatecholate], -   [5-methyl-2,3-bis-(2,6-di-iso-propylphenylimino)-2,3-dihydrohydrofuran]nickel(II)     [3,6-di-iso-propylcatecholate], -   [1-(2,6-di-iso-propylphenylimino)-2-(2,6-dimethylphenylimino)-cyclohexane]nickel(I)     [3,6-di-iso-propylcatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-[1,4]dithiane]nickel(II)     [3,6-di-iso-propylcatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-piperazine]nickel(II)     [3,6-di-iso-propylcatecholate], -   [1,4-dimethyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-piperazine]nickel(II)     [3,6-di-iso-propylcatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-bicyclo[2.2.1]-heptane]nickel(II)     [3,6-di-iso-propylcatecholate], -   [1,4-dimethyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-[1,4]diazepane]nickel(II)     [3,6-di-iso-propylcatecholate], -   [1-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-cyclopentane]nickel(II)     [3,6-di-iso-propylcatecholate], -   [5-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-tetrahydrofuran]nickel(II)     [3,6-di-iso-propylcatecholate], -   [5-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-2,3-dihydrohydrofuran]nickel(II)     [3,6-di-iso-propylcatecholate], -   [1-(2,6-di-iso-propylphenylimino)-2-(2,5-di-tert-butylphenylimino)-cyclohexane]nickel(II)     [3,6-di-iso-propylcatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-[1,4]dithiane]nickel(II)     [3,6-di-iso-propylcatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-piperazine]nickel(II)     [3,6-di-iso-propylcatecholate], -   [1,4-dimethyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-piperazine]nickel(II)     [3,6-di-iso-propylcatecholate], -   [2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-bicyclo[2.2.1]-heptane]nickel(II)     [3,6-di-iso-propylcatecholate], -   [1,4-dimethyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-[1,4]diazepane]nickel(II)     [3,6-di-iso-propylcatecholate], -   [1-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-cyclopentane]nickel(II)     [3,6-di-iso-propylcatecholate], -   [5-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-tetrahydrofuran]nickel(II)     [3,6-di-iso-propylcatecholate], and -   [5-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-2,3-dihydrohydrofuran]nickel(II)     [3,6-di-iso-propylcatecholate].

A similar list of platinum, palladium, cobalt, iron and copper complexes can be generated using the above list by substituting “nickel(II)” with platinum(II), palladium(II), cobalt(II), cobalt(I), iron(II), or copper(I). For example, [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butylcatecholate] would become:

-   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]platinum(II)     [3,6-di-tert-butylcatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]palladium(II)     [3,6-di-tert-butylcatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]cobalt(II)     [3,6-di-tert-butylcatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]cobalt(I)     [3,6-di-tert-butylcatecholate], -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]iron(II)     [3,6-di-tert-butylcatecholate], or -   [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]copper(I)     [3,6-di-tert-butylcatecholate]. In this list, the transition metal     compounds of nickel(II) and palladium(II) are most preferred.

Examples of compounds with ligand type L*2 include:

-   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4,6-trimethylbenzenamine]cobalt(I)     [3,5-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-methylbenzenamine]cobalt(I)     [3,5-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-dimethylbenzenamine]cobalt(I)     [3,5-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4-dimethylbenzenamine]cobalt(I)     [3,5-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-di-iso-propylbenzenamine]cobalt(I)     [3,5-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-di-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,5-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,5-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-6-methylbenzenamine]cobalt(I)     [3,5-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-benzenamine]cobalt(I)     [3,5-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4,6-triethylbenzenamine]cobalt(I)     [3,5-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-ethylbenzenamine]cobalt(I)     [3,5-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-diethylbenzenamine]cobalt(I)     [3,5-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4-diethylbenzenamine]cobalt(I)     [3,5-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-di-iso-propyl4-ethylbenzenamine]cobalt(I)     [3,5-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-4-ethylbenzenamine]cobalt(I)     [3,5-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-6-ethylbenzenamine]cobalt(I)     [3,5-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2,4,6-trimethylbenzenamine]cobalt(l)     [3,5-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2-methylbenzenamine]cobalt(I)     [3,5-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2,6-dimethylbenzenamine]cobalt(I)     [3,5-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2,4-dimethylbenzena     mine]cobalt(I) [3,5-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2,6-di-iso-propylbenzenamine]cobalt(I)     [3,5-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2,6-di-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,5-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,5-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2-iso-propyl-6-methylbenzenamine]cobalt(I)     [3,5-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2-iso-propylbenzenamine]cobalt(I)     [3,5-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[benzenamine) cobalt(I)     [3,5-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2-iso-propylbenzenamine]cobalt(I)     [3,5-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2-iso-propyl-6-methylbenzenamine]cobalt(I)     [3,5-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,5-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2,6-di-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,5-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2,6-di-iso-propylbenzenamine]cobalt(I)     [3,5-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2,4-dimethylbenzenamine]cobalt(I)     [3,5-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2,6-dimethylbenzenamine]cobalt(I)     [3,5-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2-methylbenzenamine]cobalt(I)     [3,5-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2,4,6-trimethylbenzenamine]cobalt(I)     [3,5-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[2-methylbenzenamine][2-iso-propylbenzenamine]cobalt(I)     [3,5-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[2-methylbenzenamine][2-iso-propyl-6-methylbenzenamine]cobalt(I)     [3,5-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[2-methylbenzenamine][2-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,5-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[2-methylbenzenamine][2,6-di-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,5-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[2-methylbenzenamine][2,6-di-iso-propylbenzenamine]cobalt(I)     [3,5-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[2-methylbenzenamine][2,4-dimethylbenzenamine]cobalt(I)     [3,5-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[2-methylbenzenamine][2,6-dimethylbenzenamine]cobalt(I)     [3,5-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[2-methylbenzenamine][2,4,6-trimethylbenzenamine]cobalt(l)     [3,5-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2,4,6-trimethylbenzenamine]cobalt(I)     [3,5-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2-methylbenzenamine]cobalt(I)     [3,5-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2,6-dimethylbenzenamine]cobalt(I)     [3,5-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2,4-dimethylbenzenamine]cobalt(I)     [3,5-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2,6-di-iso-propylbenzenamine]cobalt(I)     [3,5-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2,6-di-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,5-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,5-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2-iso-propyl-6-methylbenzenamine]cobalt(I)     [3,5-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2-iso-propyl-benzenamine]cobalt(I)     [3,5-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2-ethylbenzenamine]cobalt(I)     [3,5-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4,6-trimethylbenzenamine)     cobalt(l) [3,6-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-methylbenzenamine]cobalt(I)     [3,6-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-dimethylbenzenamine]cobalt(I)     [3,6-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4-dimethylbenzenamine]cobalt(I)     [3,6-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-di-iso-propylbenzenamine]cobalt(I)     [3,6-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-di-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,6-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,6-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-6-methylbenzenamine]cobalt(I)     [3,6-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-benzenamine]cobalt(I)     [3,6-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4,6-triethylbenzenamine]cobalt(I)     [3,6-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-ethylbenzenamine]cobalt(I)     [3,6-di-tert-butylcatecholate), -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-diethylbenzenamine]cobalt(I)     [3,6-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4-diethylbenzenamine]cobalt(I)     [3,6-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-di-iso-propyl-4-ethylbenzenamine]cobalt(I)     [3,6-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-4-ethylbenzenamine]cobalt(I)     [3,6-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-6-ethylbenzenamine]cobalt(I)     [3,6-di-tert-butylcatecholate), -   N,N′-(2,6-pyrdinediyldimethylidyne)bis[2,4,6-trimethylbenzenamine]cobalt(I)     [3,6-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2-methylbenzenamine]cobalt(I)     [3,6-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2,6-dimethylbenzenamine]cobalt(I)     [3,6-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2,4-dimethylbenzenamine]cobalt(I)     [3,6-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2,6-di-iso-propylbenzenamine]cobalt(I)     [3,6-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2,6-di-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,6-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,6-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2-iso-propyl-6-methylbenzenamine]cobalt(I)     [3,6-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2-iso-propylbenzenamine]cobalt(I)     [3,6-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[benzenamine]cobalt(I)     [3,6-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2-iso-propylbenzenamine]cobalt(I)     [3,6-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2-iso-propyl-6-methylbenzenamine]cobalt(I)     [3,6-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,6-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)     [benzenamine][2,6-di-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,6-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2,6-di-iso-propylbenzenamine]cobalt(I)     [3,6-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2,4-dimethylbenzenamine]cobalt(I)     [3,6-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2,6-dimethylbenzenamine]cobalt(I)     [3,6-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2-methylbenzenamine]cobalt(I)     [3,6-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2,4,6-trimethylbenzenamine]cobalt(I)     [3,6-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[2-methylbenzenamine][2-iso-propylbenzenamine]cobalt(I)     [3,6-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[2-methylbenzenamine][2-iso-propyl-6-methylbenzenamine]cobalt(I)     [3,6-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)     [2-methylbenzenamine][2-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,6-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[2-methylbenzenamine][2,6-di-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,6-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[2-methylbenzenamine][2,6-di-iso-propylbenzenamine]cobalt(I)     [3,6-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[2-methylbenzenamine][2,4-dimethylbenzenamine]cobalt(I)     [3,6-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[2-methylbenzenamine][2,6-dimethylbenzenamine]cobalt(I)     [3,6-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[2-methylbenzenamine][2,4,6-trimethylbenzenamine]cobalt(I)     [3,6-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2,4,6-trimethylbenzenamine]cobalt(I)     [3,6-di-tert-butylcatecholate), -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2-methylbenzenamine]cobalt(I)     [3,6-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2,6-dimethylbenzenamine]cobalt(I)     [3,6-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2,4-dimethylbenzenamine]cobalt(I)     [3,6-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2,6-di-iso-propylbenzenamine]cobalt(I)     [3,6-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2,6-di-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,6-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,6-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2-iso-propyl-6-methylbenzenamine]cobalt(I)     [3,6-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2-iso-propyl-benzenamine]cobalt(I)     [3,6-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2-ethylbenzenamine]cobalt(I)     [3,6-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4,6-trimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-chlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-chlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-dimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-chlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4-dimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-chlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-di-iso-propylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-chlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-di-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-chlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-chlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-6-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-chlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-benzenamine]cobalt(I)     [3,6-di-tert-butyl-4-chlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4,6-triethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-chlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-ethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-chlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-diethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-chlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4-diethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-chlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-di-iso-propyl-4-ethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-chlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-4-ethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-chlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-6-ethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-chlorocatecholate], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2,4,6-trimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-chlorocatecholate], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-chlorocatecholate], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2,6-dimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-chlorocatecholate], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2,4-dimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-chlorocatecholate], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2,6-di-iso-propylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-chlorocatecholate], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2,6-di-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-chlorocatecholate], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-chlorocatecholate], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2-iso-propyl-6-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-chlorocatecholate], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2-iso-propylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-chlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[benzenamine]cobalt(I)     [3,6-di-tert-butyl-4-chlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2-iso-propylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-chlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2-iso-propyl-6-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-chlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-chlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2,6-di-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-chlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2,6-di-iso-propylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-chlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2,4-dimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-chlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2,6-dimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-chlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-chlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2,4,6-trimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-chlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[2-methylbenzenamine][2-iso-propylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-chlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[2-methylbenzenamine][2-iso-propyl-6-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-chlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[2-methylbenzenamine][2-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-chlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[2-methylbenzenamine][2,6-di-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-chlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[2-methylbenzenamine][2,6-di-iso-propylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-chlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[2-methylbenzenamine][2,4-dimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-chlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[2-methylbenzenamine][2,6-dimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-chlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[2-methylbenzenamine][2,4,6-trimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-chlorocatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2,4,6-trimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-chlorocatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-chlorocatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2,6-dimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-chlorocatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2,4-dimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-chlorocatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2,6-di-iso-propylbenzenamine]cobalt(l)     [3,6-di-tert-butyl-4-chlorocatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2,6-di-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-chlorocatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-chlorocatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2-iso-propyl-6-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-chlorocatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2-iso-propyl-benzenamine]cobalt(I)     [3,6-di-tert-butyl-4-chlorocatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2-ethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-chlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4,6-trimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-dimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4-dimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-di-iso-propylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-di-iso-propyl-4-methylbenzenamine]cobalt(I)[3,6-di-tert-butyl-4,5-dichlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-6-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-benzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4,6-triethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-ethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-diethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4-diethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-di-iso-propyl-4-ethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-4-ethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-6-ethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2,4,6-trimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2,6-dimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2,4-dimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2,6-di-iso-propylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2,6-di-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2-iso-propyl-6-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2-iso-propylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[benzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2-iso-propylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2-iso-propyl-6-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2,6-di-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2,6-di-iso-propylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2,4-dimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2,6-dimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2,4,6-trimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[2-methylbenzenamine][2-iso-propylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[2-methylbenzenamine][2-iso-propyl-6-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[2-methylbenzenamine][2-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[2-methylbenzenamine][2,6-di-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[2-methylbenzenamine][2,6-di-iso-propylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)     [2-methylbenzenamine][2,4-dimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[2-methylbenzenamine][2,6-dimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[2-methylbenzenamine][2,4,6-trimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2,4,6-trimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2,6-dimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2,4-dimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2,6-di-iso-propylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2,6-di-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2-iso-propyl-6-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2-iso-propyl-benzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2-ethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4,6-trimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-methoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-methoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-dimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-methoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4-dimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-methoxycatecholate), -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-di-iso-propylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-methoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-di-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-methoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-methoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-6-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-methoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-benzenamine]cobalt(I)     [3,6-di-tert-butyl-4-methoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4,6-triethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-methoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-ethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-methoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-diethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-methoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4-diethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-methoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-di-iso-propyl-4-ethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-methoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-4-ethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-methoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-6-ethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-methoxycatecholate], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2,4,6-trimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-methoxycatecholate], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-methoxycatecholate], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2,6-dimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-methoxycatecholate], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2,4-dimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-methoxycatecholate], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2,6-di-iso-propylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-methoxycatecholate], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2,6-di-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-methoxycatecholate], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-methoxycatecholate], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2-iso-propyl-6-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-methoxycatecholate], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2-iso-propylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-methoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[benzenamine]cobalt(I)     [3,6-di-tert-butyl-4-methoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2-iso-propylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-methoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2-iso-propyl-6-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-methoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-methoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2,6-di-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-methoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2,6-di-iso-propylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-methoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2,4-dimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-methoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2,6-dimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-methoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-methoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2,4,6-trimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-methoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[2-methylbenzenamine][2-iso-propylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-methoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[2-methylbenzenamine][2-iso-propyl-6-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-methoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[2-methylbenzenamine][2-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-methoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[2-methylbenzenamine][2,6-di-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-methoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[2-methylbenzenamine][2,6-di-iso-propylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-methoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[2-methylbenzenamine][2,4-dimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-methoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[2-methylbenzenamine][2,6-dimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-methoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[2-methylbenzenamine][2,4,6-trimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-methoxycatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2,4,6-trimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-methoxycatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-methoxycatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2,6-dimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-methoxycatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2,4-dimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-methoxycatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2,6-di-iso-propylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-methoxycatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2,6-di-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-methoxycatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-methoxycatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2-iso-propyl-6-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-methoxycatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2-iso-propyl-benzenamine]cobalt(I)     [3,6-di-tert-butyl-4-methoxycatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2-ethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4-methoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4,6-trimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-dimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4-dimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-di-iso-propylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-di-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-6-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-benzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4,6-triethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-ethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-diethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4-diethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-di-iso-propyl-4-ethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-4-ethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-6-ethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2,4,6-trimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2,6-dimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2,4-dimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2,6-di-iso-propylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2,6-di-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2-iso-propyl-6-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   N,N′-(2,6-pyridinediyldimethylidyne)bis[2-iso-propylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[benzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2-iso-propylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2-iso-propyl-6-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2,6-di-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2,6-di-iso-propylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2,4-dimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2,6-dimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[benzenamine][2,4,6-trimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[2-methylbenzenamine][2-iso-propylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[2-methylbenzenamine][2-iso-propyl-6-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[2-methylbenzenamine][2-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[2-methylbenzenamine][2,6-di-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[2-methylbenzenamine][2,6-di-iso-propylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[2-methylbenzenamine][2,4-dimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[2-methylbenzenamine][2,6-dimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)[2-methylbenzenamine][2,4,6-trimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2,4,6-trimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2,6-dimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2,4-dimethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2,6-di-iso-propylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2,6-di-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2-iso-propyl-6-methylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2-iso-propyl-benzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   N,N′-(2,6-pyridinediyldibenzylidyne)bis[2-ethylbenzenamine]cobalt(I)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4,6-trimethylbenzenamine]cobalt(I)     [4-iso-propylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-methylbenzenamine]cobalt(I)     [4-iso-propylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-dimethylbenzenamine]cobalt(I)     [4-iso-propylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4-dimethylbenzenamine]cobalt(I)     [4-iso-propylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-di-iso-propylbenzenamine]cobalt(I)     [4-iso-propylcatecholate], -   N,N′-(2,6-pyrdinediyldiethylidyne)bis[2,6-di-iso-propyl-4-methylbenzenamine]cobalt(I)     [4-iso-propylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-4-methylbenzenamine]cobalt(I)     [4-iso-propylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-6-methylbenzenamine]cobalt(I)     [4-iso-propylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-benzenamine]cobalt(I)     [4-iso-propylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4,6-triethylbenzenamine]cobalt(I)     [4-iso-propylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-ethylbenzenamine]cobalt(I)     [4-iso-propylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-diethylbenzenamine]cobalt(I)     [4-iso-propylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4-diethylbenzenamine]cobalt(I)     [4-iso-propylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4,6-trimethylbenzenamine]cobalt(I)     [4,5-di-iso-propylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-methylbenzenamine]cobalt(I)     [4,5-di-iso-propylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-dimethylbenzenamine]cobalt(I)     [4,5-di-iso-propylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4-dimethylbenzenamine]cobalt(I)     [4,5-di-iso-propylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-di-iso-propylbenzenamine]cobalt(I)     [4,5-di-iso-propylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-di-iso-propyl-4-methylbenzenamine     cobalt(I) [4,5-di-iso-propylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-4-methylbenzenamine]cobalt(I)     [4,5-di-iso-propylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-6-methylbenzenamine]cobalt(I)     [4,5-di-iso-propylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-benzenamine]cobalt(I)     [4,5-di-iso-propylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4,6-triethylbenzenamine]cobalt(I)     [4,5-di-iso-propylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-ethylbenzenamine]cobalt(I)     [4,5-di-iso-propylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-diethylbenzenamine]cobalt(I)     [4,5-di-iso-propylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4-diethylbenzenamine]cobalt(I)     [4,5-di-iso-propylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4,6-trimethylbenzenamine]cobalt(I)     [4-cyclohexylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-methylbenzenamine]cobalt(I)     [4-cyclohexylcatecholate), -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-dimethylbenzenamine]cobalt(I)     [4-cyclohexylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4-dimethylbenzenamine]cobalt(I)     [4-cyclohexylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-di-iso-propylbenzenamine]cobalt(I)     [4-cyclohexylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-di-iso-propyl-4-methylbenzenamine]cobalt(I)     [4-cyclohexylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-4-methylbenzenamine]cobalt(I)     [4-cyclohexylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-6-methylbenzenamine]cobalt(I)     [4-cyclohexylcatecholate), -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-benzenamine]cobalt(I)     [4-cyclohexylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4,6-triethylbenzenamine]cobalt(I)     [4-cyclohexylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-ethylbenzenamine]cobalt(I)     [4-cyclohexylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-diethylbenzenamine]cobalt(I)     [4-cyclohexylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4-diethylbenzenamine]cobalt(I)     [4-cyclohexylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4,6-trimethylbenzenamine]cobalt(I)     [3,4,6-tri-iso-propylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-methylbenzenamine]cobalt(I)     [3,4,6-tri-iso-propylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-dimethylbenzenamine]cobalt(I)     [3,4,6-tri-iso-propylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4-dimethylbenzenamine]cobalt(I)     [3,4,6-tri-iso-propylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-di-iso-propylbenzenamine]cobalt(I)     [3,4,6-tri-iso-propylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-di-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,4,6-tri-iso-propylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,4,6-tri-iso-propylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-6-methylbenzenamine]cobalt(I)     [3,4,6-tri-iso-propylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-benzenamine]cobalt(I)     [3,4,6-tri-iso-propylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4,6-triethylbenzenamine]cobalt(I)     [3,4,6-tri-iso-propylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-ethylbenzenamine]cobalt(I)     [3,4,6-tri-iso-propylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-diethylbenzenamine]cobalt(I)     [3,4,6-tri-iso-propylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4-diethylbenzenamine]cobalt(I)     [3,4,6-tri-iso-propylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4,6-trimethylbenzenamine]cobalt(I)     [3,6-di-iso-propylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-methylbenzenamine]cobalt(I)     [3,6-di-iso-propylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-dimethylbenzenamine]cobalt(I)     [3,6-di-iso-propylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4-dimethylbenzenamine]cobalt(I)     [3,6-di-iso-propylcatecholate), -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-di-iso-propylbenzenamine]cobalt(I)     [3,6-di-iso-propylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-di-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,6-di-iso-propylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-4-methylbenzenamine]cobalt(I)     [3,6-di-iso-propylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-6-methylbenzenamine]cobalt(I)     [3,6-di-iso-propylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-benzenamine]cobalt(I)     [3,6-di-iso-propylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4,6-triethylbenzenamine]cobalt(I)     [3,6-di-iso-propylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-ethylbenzenamine]cobalt(I)     [3,6-di-iso-propylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-diethylbenzenamine]cobalt(I)     [3,6-di-iso-propylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4-diethylbenzenamine]cobalt(I)     [3,6-di-iso-propylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4,6-trimethylbenzenamine]cobalt(I)     [naphthalene-2,3-diolate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-methylbenzenamine]cobalt(I)     [naphthalene-2,3-diolate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-dimethylbenzenamine]cobalt(I)     [naphthalene-2,3-diolate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4-dimethylbenzenamine]cobalt(I)     [naphthalene-2,3-diolate), -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-di-iso-propylbenzenamine]cobalt(I)     [naphthalene-2,3-diolate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-di-iso-propyl-4-methylbenzenamine]cobalt(I)     [naphthalene-2,3-diolate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-4-methylbenzenamine]cobalt(I)     [naphthalene-2,3-diolate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-6-methylbenzenamine]cobalt(I)     [naphthalene-2,3-diolate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-benzenamine]cobalt(I)     [naphthalene-2,3-diolate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4,6-triethylbenzenamine]cobalt(I)     [naphthalene-2,3-diolate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-ethylbenzenamine]cobalt(I)     [naphthalene-2,3-diolate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-diethylbenzenamine]cobalt(I)     [naphthalene-2,3-diolate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4-diethylbenzenamine]cobalt(I)     [naphthalene-2,3-diolate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4,6-trimethylbenzenamine]cobalt(I)     [phenanthrene-9,10-diolate), -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-methylbenzenamine]cobalt(I)     [phenanthrene-9,10-diolate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-dimethylbenzenamine]cobalt(I)     [phenanthrene-9,10-diolate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4-dimethylbenzenamine]cobalt(I)     [phenanthrene-9,10-diolate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-di-iso-propylbenzenamine]cobalt(I)     [phenanthrene-9,10-diolate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-di-iso-propyl-4-methylbenzenamine]cobalt(I)     [phenanthrene-9,10-diolate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-4-methylbenzenamine]cobalt(I)     [phenanthrene-9,10-diolate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-6-methylbenzenamine]cobalt(I)     [phenanthrene-9,10-diolate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-benzenamine]cobalt(I)     [phenanthrene-9,10-diolate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4,6-triethylbenzenamine]cobalt(I)     [phenanthrene-9,10-diolate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2-ethylbenzenamine]cobalt(I)     [phenanthrene-9,10-diolate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-diethylbenzenamine]cobalt(I)     [phenanthrene-9,10-diolate], and -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4-diethylbenzenamine]cobalt(I)     [phenanthrene-9,10-diolate].

A similar list of platinum, palladium, nickel, iron, copper and cobalt(II) complexes can be generated using the above list by substituting “cobalt(I)” with platinum(II), palladium(II), nickel(II), iron(II), copper(I), or cobalt(II). For example, N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4,6-trimethylbenzenamine]cobalt(I) [3,5-di-tert-butylcatecholate] would become:

-   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4,6-trimethylbenzenamine]platinum(II)     [3,5-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4,6-trimethylbenzenamine]palladium(II)     [3,5-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4,6-trimethylbenzenamine]nickel(II)     [3,5-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4,6-trimethylbenzenamine]iron(II)     [3,5-di-tert-butylcatecholate], -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4,6-trimethylbenzenamine]copper(I)     [3,5-di-tert-butylcatecholate], or -   N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4,6-trimethylbenzenamine]cobalt(II)     [3,5-di-tert-butylcatecholate]. In this list, the transition metal     compounds of iron(II), cobalt(I) and cobalt(II) are most preferred.

Examples of compounds with ligand type L* 13 include:

-   [2-(N-(2,6-dimethylphenyl)-iminomethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-iminomethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-iminomethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-iminomethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2,6-diethylphenyl)-iminomethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2,4,6-trimethylphenyl)-iminomethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-iminomethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2,6-dimethylphenyl)-imino-2-ethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-imino-2-ethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-imino-2-ethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-imino-2-ethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2,6-diethylphenyl)-imino-2-ethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2,4,6-trimethylphenyl)-imino-2-ethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-imino-2-ethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2,6-dimethylphenyl)-iminomethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-iminomethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-iminomethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-iminomethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2,6-diethylphenyl)-iminomethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2,4,6-trimethylphenyl)-iminomethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-iminomethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2,6-dimethylphenyl)-imino-2-ethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-imino-2-ethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-imino-2-ethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-imino-2-ethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2,6-diethylphenyl)-imino-2-ethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2,4,6-trimethylphenyl)-imino-2-ethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-imino-2-ethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2,6-dimethylphenyl)-iminomethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-iminomethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-iminomethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-iminomethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2,6-diethylphenyl)-iminomethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2,4,6-trimethylphenyl)-iminomethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-iminomethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2,6-dimethylphenyl)-imino-2-ethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-imino-2-ethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-imino-2-ethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-imino-2-ethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2,6-diethylphenyl)-imino-2-ethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2,4,6-trimethylphenyl)-imino-2-ethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-imino-2-ethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2,6-dimethylphenyl)-iminomethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-iminomethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-iminomethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-iminomethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2,6-diethylphenyl)-iminomethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2,4,6-trimethylphenyl)-iminomethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-iminomethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2,6-dimethylphenyl)-imino-2-ethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-imino-2-ethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-imino-2-ethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-catecholate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-imino-2-ethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2,6-diethylphenyl)-imino-2-ethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2,4,6-trimethylphenyl)-imino-2-ethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-imino-2-ethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2,6-dimethylphenyl)-iminomethyl)-pyridine]nickel(II)     [3,5-di-tert-butyl-catecholate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-iminomethyl)-pyridine]nickel(II)     [3,5-di-tert-butyl-catecholate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-iminomethyl)-pyridine]nickel(II)     [3,5-di-tert-butyl-catecholate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-iminomethyl)-pyridine]nickel(II)     [3,5-di-tert-butyl-catecholate], -   [2-(N-(2,6-diethylphenyl)-iminomethyl)-pyridine]nickel(II)     [3,5-di-tert-butyl-catecholate], -   [2-(N-(2,4,6-trimethylphenyl)-iminomethyl)-pyridine]nickel(II)     [3,5-di-tert-butyl-catecholate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-iminomethyl)-pyridine]nickel(II)     [3,5-di-tert-butyl-catecholate], -   [2-(N-(2,6-dimethylphenyl)-imino-2-ethyl)-pyridine]nickel(II)     [3,5-di-tert-butyl-catecholate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-imino-2-ethyl)-pyridine)     nickel(II) [3,5-di-tert-butyl-catecholate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-imino-2-ethyl)-pyridine]nickel(II)     [3,5-di-tert-butyl-catecholate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-imino-2-ethyl)-pyridine]nickel(II)     [3,5-di-tert-butyl-catecholate], -   [2-(N-(2,6-diethylphenyl)-imino-2-ethyl)-pyridine]nickel(II)     [3,5-di-tert-butyl-catecholate], -   [2-(N-(2,4,6-trimethylphenyl)-imino-2-ethyl)-pyridine]nickel(II)     [3,5-di-tert-butyl-catecholate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-imino-2-ethyl)-pyridine]nickel(II)     [3,5-di-tert-butyl-catecholate], -   [2-(N-(2,6-dimethylphenyl)-iminomethyl)-pyrazine]nickel(II)     [3,5-di-tert-butyl-catecholate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-iminomethyl)-pyrazine]nickel(II)     [3,5-di-tert-butyl-catecholate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-iminomethyl)-pyrazine]nickel(II)     [3,5-di-tert-butyl-catecholate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-iminomethyl)-pyrazine]nickel(II)     [3,5-di-tert-butyl-catecholate], -   [2-(N-(2,6-diethylphenyl)-iminomethyl)-pyrazine]nickel(II)     [3,5-di-tert-butyl-catecholate], -   [2-(N-(2,4,6-trimethylphenyl)-iminomethyl)-pyrazine]nickel(II)     [3,5-di-tert-butyl-catecholate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-iminomethyl)-pyrazine]nickel(II)     [3,5-di-tert-butyl-catecholate], -   [2-(N-(2,6-dimethylphenyl)-imino-2-ethyl)-pyrazine]nickel(II)     [3,5-di-tert-butyl-catecholate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-imino-2-ethyl)-pyrazine]nickel(II)     [3,5-di-tert-butyl-catecholate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-imino-2-ethyl)-pyrazine]nickel(II)     [3,5-di-tert-butyl-catecholate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-imino-2-ethyl)-pyrazine]nickel(II)     [3,5-di-tert-butyl-catecholate], -   [2-(N-(2,6-diethylphenyl)-imino-2-ethyl)-pyrazine]nickel(II)     [3,5-di-tert-butyl-catecholate), -   [2-(N-(2,4,6-trimethylphenyl)-imino-2-ethyl)-pyrazine]nickel(II)     [3,5-di-tert-butyl-catecholate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-imino-2-ethyl)-pyrazine]nickel(II)     [3,5-di-tert-butyl-catecholate), -   [2-(N-(2,6-dimethylphenyl)-iminomethyl)-pyrimidine]nickel(II)     [3,5-di-tert-butyl-catecholate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-iminomethyl)-pyrimidine]nickel(II)     [3,5-di-tert-butyl-catecholate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-iminomethyl)-pyrimidine]nickel(II)     [3,5-di-tert-butyl-catecholate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-iminomethyl)-pyrimidine]nickel(II)     [3,5-di-tert-butyl-catecholate], -   [2-(N-(2,6-diethylphenyl)-iminomethyl)-pyrimidine]nickel(II)     [3,5-di-tert-butyl-catecholate], -   [2-(N-(2,4,6-trimethylphenyl)-iminomethyl)-pyrimidine]nickel(II)     [3,5-di-tert-butyl-catecholate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-iminomethyl)-pyrimidine]nickel(II)     [3,5-di-tert-butyl-catecholate], -   [2-(N-(2,6-dimethylphenyl)-imino-2-ethyl)-pyrimidine]nickel(II)     [3,5-di-tert-butyl-catecholate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-imino-2-ethyl)-pyrimidine]nickel(II)     [3,5-di-tert-butyl-catecholate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-imino-2-ethyl)-pyrimidine]nickel(II)     [3,5-di-tert-butyl-catecholate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-imino-2-ethyl)-pyrimidine]nickel(II)     [3,5-di-tert-butyl-catecholate], -   [2-(N-(2,6-diethylphenyl)-imino-2-ethyl)-pyrimidine]nickel(II)     [3,5-di-tert-butyl-catecholate], -   [2-(N-(2,4,6-trimethylphenyl)-imino-2-ethyl)-pyrimidine]nickel(II)     [3,5-di-tert-butyl-catecholate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-imino-2-ethyl)-pyrimidine]nickel(II)     [3,5-di-tert-butyl-catecholate], -   [2-(N-(2,6-dimethylphenyl)-iminomethyl)-[1,3,5]-triazine]nickel(II)     [3,5-di-tert-butyl-catecholate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-iminomethyl)-[1,3,5]-triazine]nickel(II)     [3,5-di-tert-butyl-catecholate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-iminomethyl)-[1,3,5]-triazine]nickel(II)     [3,5-di-tert-butyl-catecholate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-iminomethyl)-[1,3,5]-triazine]nickel(II)     [3,5-di-tert-butyl-catecholate], -   [2-(N-(2,6-diethylphenyl)-iminomethyl)-[1,3,5]-triazine]nickel(II)     [3,5-di-tert-butyl-catecholate], -   [2-(N-(2,4,6-trimethylphenyl)-iminomethyl)-[1,3,5]-triazine]nickel(II)     [3,5-di-tert-butyl-catecholate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-iminomethyl)-[1,3,5]-triazine]nickel(II)     [3,5-di-tert-butyl-catecholate], -   [2-(N-(2,6-dimethylphenyl)-imino-2-ethyl)-[1,3,5]-triazine]nickel(II)     [3,5-di-tert-butyl-catecholate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-imino-2-ethyl)-[1,3,5]-triazine]nickel(II)     [3,5-di-tert-butyl-catecholate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-imino-2-ethyl)-[1,3,5]-triazine]nickel(II)     [3,5-di-catecholate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-imino-2-ethyl)-[1,3,5]-triazine]nickel(II)     [3,5-di-tert-butyl-catecholate], -   [2-(N-(2,6-diethylphenyl)-imino-2-ethyl)-[1,3,5]-triazine]nickel(II)     [3,5-di-tert-butyl-catecholate], -   [2-(N-(2,4,6-trimethylphenyl)-imino-2-ethyl)-[1,3,5]-triazine]nickel(II)     [3,5-di-tert-butyl-catecholate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-imino-2-ethyl)-[1,3,5]-triazine]nickel(II)     [3,5-di-tert-butyl-catecholate], -   [2-(N-(2,6-dimethylphenyl)-iminomethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-iminomethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-iminomethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-iminomethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(N-(2,6-diethylphenyl)-iminomethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(N-(2,4,6-trimethylphenyl)-iminomethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-iminomethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(N-(2,6-dimethylphenyl)-imino-2-ethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-imino-2-ethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-imino-2-ethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-imino-2-ethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(N-(2,6-diethylphenyl)-imino-2-ethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(N-(2,4,6-trimethylphenyl)-imino-2-ethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-imino-2-ethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(N-(2,6-dimethylphenyl)-iminomethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-iminomethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-iminomethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-iminomethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(N-(2,6-diethylphenyl)-iminomethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(N-(2,4,6-trimethylphenyl)-iminomethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-iminomethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(N-(2,6-dimethylphenyl)-imino-2-ethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-imino-2-ethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-imino-2-ethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-imino-2-ethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(N-(2,6-diethylphenyl)-imino-2-ethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(N-(2,4,6-trimethylphenyl)-imino-2-ethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-imino-2-ethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(N-(2,6-dimethylphenyl)-iminomethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-iminomethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-iminomethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-iminomethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(N-(2,6-diethylphenyl)-iminomethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(N-(2,4,6-trimethylphenyl)-iminomethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-iminomethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(N-(2,6-dimethylphenyl)-imino-2-ethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-imino-2-ethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-imino-2-ethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-imino-2-ethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(N-(2,6-diethylphenyl)-imino-2-ethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(N-(2,4,6-trimethylphenyl)-imino-2-ethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-imino-2-ethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(N-(2,6-dimethylphenyl)-iminomethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-iminomethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-iminomethyl)-[1,3,5]-triazine)     nickel(II)[3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-iminomethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(N-(2,6-diethylphenyl)-iminomethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(N-(2,4,6-trimethylphenyl)-iminomethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-iminomethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(N-(2,6-dimethylphenyl)-imino-2-ethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-imino-2-ethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-imino-2-ethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-imino-2-ethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(N-(2,6-diethylphenyl)-imino-2-ethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(N-(2,4,6-trimethylphenyl)-imino-2-ethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-imino-2-ethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-4-chlorocatecholate], -   [2-(N-(2,6-dimethylphenyl)-iminomethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-iminomethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-iminomethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-iminomethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(N-(2,6-diethylphenyl)-iminomethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(N-(2,4,6-trimethylphenyl)-iminomethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-iminomethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(N-(2,6-dimethylphenyl)-imino-2-ethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-imino-2-ethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-imino-2-ethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-imino-2-ethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(N-(2,6-diethylphenyl)-imino-2-ethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(N-(2,4,6-trimethylphenyl)-imino-2-ethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-imino-2-ethyl)-pyridine)     nickel(II) [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(N-(2,6-dimethylphenyl)-iminomethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-iminomethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-iminomethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-iminomethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(N-(2,6-diethylphenyl)-iminomethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(N-(2,4,6-trimethylphenyl)-iminomethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-iminomethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(N-(2,6-dimethylphenyl)-imino-2-ethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-imino-2-ethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-imino-2-ethyl)-pyrazine)     nickel(II) [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-imino-2-ethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(N-(2,6-diethylphenyl)-imino-2-ethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(N-(2,4,6-trimethylphenyl)-imino-2-ethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-imino-2-ethyl)-pyrazine]nickel(II)     [3,6-di-butyl-4,5-dichlorocatecholate], -   [2-(N-(2,6-dimethylphenyl)-iminomethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-iminomethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-iminomethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-iminomethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(N-(2,6-diethylphenyl)-iminomethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(N-(2,4,6-trimethylphenyl)-iminomethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-iminomethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(N-(2,6-dimethylphenyl)-imino-2-ethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-imino-2-ethyl)-pyrimidine)     nickel(II) [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-imino-2-ethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-imino-2-ethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(N-(2,6-diethylphenyl)-imino-2-ethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(N-(2,4,6-trimethylphenyl)-imino-2-ethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-imino-2-ethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate), -   [2-(N-(2,6-dimethylphenyl)-iminomethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-iminomethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-iminomethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-iminomethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(N-(2,6-diethylphenyl)-iminomethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(N-(2,4,6-trimethylphenyl)-iminomethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-iminomethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(N-(2,6-dimethylphenyl)-imino-2-ethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-imino-2-ethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-imino-2-ethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-imino-2-ethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(N-(2,6-diethylphenyl)-imino-2-ethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(N-(2,4,6-trimethylphenyl)-imino-2-ethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-imino-2-ethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-4,5-dichlorocatecholate], -   [2-(N-(2,6-dimethylphenyl)-iminomethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-iminomethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-iminomethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-iminomethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-(N-(2,6-diethylphenyl)-iminomethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-(N-(2,4,6-trimethylphenyl)-iminomethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-iminomethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-(N-(2,6-dimethylphenyl)-imino-2-ethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-imino-2-ethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-imino-2-ethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-imino-2-ethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-(N-(2,6-diethylphenyl)-imino-2-ethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-(N-(2,4,6-trimethylphenyl)-imino-2-ethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-imino-2-ethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-(N-(2,6-dimethylphenyl)-iminomethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-iminomethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-iminomethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-iminomethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-(N-(2,6-diethylphenyl)-iminomethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-(N-(2,4,6-trimethylphenyl)-iminomethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-(2,6-di-iso-propyl-4-methylphenyl)-1-iminomethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate), -   [2-(N-(2,6-dimethylphenyl)-imino-2-ethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-imino-2-ethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-imino-2-ethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-imino-2-ethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-(N-(2,6-diethylphenyl)-imino-2-ethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-(N-(2,4,6-trimethylphenyl)-imino-2-ethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-imino-2-ethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-(N-(2,6-dimethylphenyl)-iminomethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-iminomethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-iminomethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-iminomethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-(N-(2,6-diethylphenyl)-iminomethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-(N-(2,4,6-trimethylphenyl)-iminomethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-iminomethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-(N-(2,6-dimethylphenyl)-imino-2-ethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-imino-2-ethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-imino-2-ethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-imino-2-ethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-(N-(2,6-diethylphenyl)-imino-2-ethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-(N-(2,4,6-trimethylphenyl)-imino-2-ethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-imino-2-ethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-(N-(2,6-dimethylphenyl)-iminomethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-iminomethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-iminomethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-iminomethyl)-[1,3,5]-triazine]nickel(II)     [3,6-4-methoxycatecholate], -   [2-(N-(2,6-diethylphenyl)-iminomethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-(N-(2,4,6-trimethylphenyl)-iminomethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-iminomethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-(N-(2,6-dimethylphenyl)-imino-2-ethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-imino-2-ethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-imino-2-ethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-imino-2-ethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate), -   [2-(N-(2,6-diethylphenyl)-imino-2-ethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-(N-(2,4,6-trimethylphenyl)-imino-2-ethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-4-methoxycatecholate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-imino-2-ethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-4-methoxycatecholate], -   [2-(N-(2,6-dimethylphenyl)-iminomethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-iminomethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-iminomethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-iminomethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(N-(2,6-diethylphenyl)-iminomethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(N-(2,4,6-trimethylphenyl)-iminomethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-iminomethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(N-(2,6-dimethylphenyl)-imino-2-ethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-imino-2-ethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-imino-2-ethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-imino-2-ethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(N-(2,6-diethylphenyl)-imino-2-ethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(N-(2,4,6-trimethylphenyl)-imino-2-ethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-imino-2-ethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(N-(2,6-dimethylphenyl)-iminomethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-iminomethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-iminomethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-iminomethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(N-(2,6-diethylphenyl)-iminomethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(N-(2,4,6-trimethylphenyl)-iminomethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-iminomethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(N-(2,6-dimethylphenyl)-imino-2-ethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-imino-2-ethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-imino-2-ethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-imino-2-ethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(N-(2,6-diethylphenyl)-imino-2-ethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(N-(2,4,6-trimethylphenyl)-imino-2-ethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-imino-2-ethyl)-pyrazine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(N-(2,6-dimethylphenyl)-iminomethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-iminomethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-iminomethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-iminomethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(N-(2,6-diethylphenyl)-iminomethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(N-(2,4,6-trimethylphenyl)-iminomethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-iminomethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(N-(2,6-dimethylphenyl)-imino-2-ethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-imino-2-ethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-imino-2-ethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-imino-2-ethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(N-(2,6-diethylphenyl)-imino-2-ethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(N-(2,4,6-trimethylphenyl)-imino-2-ethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-imino-2-ethyl)-pyrimidine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(N-(2,6-dimethylphenyl)-iminomethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-iminomethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-iminomethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-iminomethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(N-(2,6-diethylphenyl)-iminomethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(N-(2,4,6-trimethylphenyl)-iminomethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-iminomethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(N-(2,6-dimethylphenyl)-imino-2-ethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-imino-2-ethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-imino-2-ethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-imino-2-ethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(N-(2,6-diethylphenyl)-imino-2-ethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(N-(2,4,6-trimethylphenyl)-imino-2-ethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-imino-2-ethyl)-[1,3,5]-triazine]nickel(II)     [3,6-di-tert-butyl-4,5-dimethoxycatecholate], -   [2-(N-(2,6-dimethylphenyl)-iminomethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-iminomethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-iminomethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-iminomethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [2-(N-(2,6-diethylphenyl)-iminomethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [2-(N-(2,4,6-trimethylphenyl)-iminomethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-iminomethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [2-(N-(2,6-dimethylphenyl)-imino-2-ethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-imino-2-ethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-imino-2-ethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-imino-2-ethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [2-(N-(2,6-diethylphenyl)-imino-2-ethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [2-(N-(2,4,6-trimethylphenyl)-imino-2-ethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4-iso-propylcatecholate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-imino-2-ethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4-is-propylcatecholate], -   [2-(N-(2,6-dimethylphenyl)-iminomethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-iminomethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-iminomethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-iminomethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [2-(N-(2,6-diethylphenyl)-iminomethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [2-(N-(2,4,6-trimethylphenyl)-iminomethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-iminomethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [2-(N-(2,6-dimethylphenyl)-imino-2-ethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-imino-2-ethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-imino-2-ethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-imino-2-ethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [2-(N-(2,6-diethylphenyl)-imino-2-ethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [2-(N-(2,4,6-trimethylphenyl)-imino-2-ethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-imino-2-ethyl)-pyridine]nickel(II)     [3,6-di-tert-butyl-4-cyclohexylcatecholate], -   [2-(N-(2,6-dimethylphenyl)-iminomethyl)-pyridine]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-iminomethyl)-pyridine]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-iminomethyl)-pyridine]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-iminomethyl)-pyridine]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [2-(N-(2,6-diethylphenyl)-iminomethyl)-pyridine]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [2-(N-(2,4,6-trimethylphenyl)-iminomethyl)-pyridine]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-iminomethyl)-pyridine]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [2-(N-(2,6-dimethylphenyl)-imino-2-ethyl)-pyridine]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-imino-2-ethyl)-pyridine]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-imino-2-ethyl)-pyridine]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-imino-2-ethyl)-pyridine]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [2-(N-(2,6-diethylphenyl)-imino-2-ethyl)-pyridine]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [2-(N-(2,4,6-trimethylphenyl)-imino-2-ethyl)-pyridine]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-imino-2-ethyl)-pyridine]nickel(II)     [3,4,6-tri-iso-propylcatecholate], -   [2-(N-(2,6-dimethylphenyl)-iminomethyl)-pyridine]nickel(II)     [3,6-di-iso-propylcatecholate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-iminomethyl)-pyridine]nickel(II)     [3,6-di-iso-propylcatecholate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-iminomethyl)-pyridine]nickel(II)     [3,6-di-iso-propylcatecholate], -   [2-N-(2,6-di-iso-propylphenyl)-1-iminomethyl)-pyridine]nickel(II)     [3,6-di-iso-propylcatecholate], -   [2-(N-(2,6-diethylphenyl)-iminomethyl)-pyridine]nickel(II)     [3,6-di-iso-propylcatecholate], -   [2-(N-(2,4,6-trimethylphenyl)-iminomethyl)-pyridine]nickel(II)     [3,6-di-iso-propylcatecholate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-iminomethyl)-pyridine]nickel(II)     [3,6-di-iso-propylcatecholate], -   [2-(N-(2,6-dimethylphenyl)-imino-2-ethyl)-pyridine]nickel(II)     [3,6-di-iso-propylcatecholate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-imino-2-ethyl)-pyridine]nickel(II)     [3,6-di-iso-propyl-catecholate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-imino-2-ethyl)-pyridine]nickel(II)     [3,6-di-iso-propylcatecholate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-imino-2-ethyl)-pyridine]nickel(II)     [3,6-di-iso-propylcatecholate], -   [2-(N-(2,6-diethylphenyl)-imino-2-ethyl)-pyridine]nickel(II)     [3,6-di-iso-propylcatecholate], -   [2-(N-(2,4,6-trimethylphenyl)-imino-2-ethyl)-pyridine]nickel(II)     [3,6-di-iso-propylcatecholate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-imino-2-ethyl)-pyridine]nickel(II)     [3,6-di-iso-propylcatecholate], -   [2-(N-(2,6-dimethylphenyl)-iminomethyl)-pyridine]nickel(II)     [4-methylcatecholate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-iminomethyl)-pyridine]nickel(II)     [4-methylcatecholate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-iminomethyl)-pyridine]nickel(II)     [4-methylcatecholate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-iminomethyl)-pyridine]nickel(II)     [4-methylcatecholate], -   [2-(N-(2,6-diethylphenyl)-iminomethyl)-pyridine]nickel(II)     [4-methylcatecholate], -   [2-(N-(2,4,6-trimethylphenyl)-iminomethyl)-pyridine]nickel(II)     [4-methylcatecholate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-iminomethyl)-pyridine]nickel(II)     [4-methylcatecholate], -   [2-(N-(2,6-dimethylphenyl)-imino-2-ethyl)-pyridine]nickel(II)     [4-methylcatecholate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-imino-2-ethyl)-pyridine]nickel(II)     [4-methylcatecholate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-imino-2-ethyl)-pyridine]nickel(II)     [4-methylcatecholate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-imino-2-ethyl)-pyridine]nickel(II)     [4-methylcatecholate], -   [2-(N-(2,6-diethylphenyl)-imino-2-ethyl)-pyridine]nickel(II)     [4-methylcatecholate], -   [2-(N-(2,4,6-trimethylphenyl)-imino-2-ethyl)-pyridine]nickel(II)     [4-methylcatecholate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-imino-2-ethyl)-pyridine]nickel(II)     [4-methylcatecholate], -   [2-(N-(2,6-dimethylphenyl)-iminomethyl)-pyridine]nickel(II)     [naphthalene-2,3-diolate],     [2-(N-(2-iso-propyl-6-methylphenyl)-iminomethyl)-pyridine]nickel(II)     [naphthalene-2,3-diolate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-iminomethyl)-pyridine]nickel(II)     [naphthalene-2,3-diolate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-iminomethyl)-pyridine]nickel(II)     [naphthalene-2,3-diolate], -   [2-(N-(2,6-diethylphenyl)-iminomethyl)-pyridine]nickel(II)     [naphthalene-2,3-diolate], -   [2-(N-(2,4,6-trimethylphenyl)-iminomethyl)-pyridine]nickel(II)     [naphthalene-2,3-diolate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-iminomethyl)-pyridine]nickel(II)     [naphthalene-2,3-diolate], -   [2-(N-(2,6-dimethylphenyl)-imino-2-ethyl)-pyridine]nickel(II)     [naphthalene-2,3-diolate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-imino-2-ethyl)-pyridine]nickel(II)     [naphthalene-2,3-diolate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-imino-2-ethyl)-pyridine]nickel(II)     [naphthalene-2,3-diolate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-imino-2-ethyl)-pyridine]nickel(II)     [naphthalene-2,3-diolate], -   [2-(N-(2,6-diethylphenyl)-imino-2-ethyl)-pyridine]nickel(II)     [naphthalene-2,3-diolate], -   [2-(N-(2,4,6-trimethylphenyl)-imino-2-ethyl)-pyridine]nickel(II)     [naphthalene-2,3-diolate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-imino-2-ethyl)-pyridine]nickel(II)     [naphthalene-2,3-diolate], -   [2-(N-(2,6-dimethylphenyl)-iminomethyl)-pyridine]nickel(II)     [phenanthrene-9,10-diolate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-iminomethyl)-pyridine]nickel(II)     [phenanthrene-9,10-diolate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-iminomethyl)-pyridine]nickel(II)     [phenanthrene-9,10-diolate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-iminomethyl)-pyridine]nickel(II)     [phenanthrene-9,10-diolate], -   [2-(N-(2,6-diethylphenyl)-iminomethyl)-pyridine]nickel(II)     [phenanthrene-9,10-diolate], -   [2-(N-(2,4,6-trimethylphenyl)-iminomethyl)-pyridine]nickel(II)     [phenanthrene-9,10-diolate], -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-iminomethyl)-pyridine]nickel(II)     [phenanthrene-9,10-diolate), -   [2-(N-(2,6-dimethylphenyl)-imino-2-ethyl)-pyridine]nickel(II)     [phenanthrene-9,10-diolate], -   [2-(N-(2-iso-propyl-6-methylphenyl)-imino-2-ethyl)-pyridine]nickel(II)     [phenanthrene-9,10-diolate], -   [2-(N-(2,5-di-tert-butylphenyl)-1-imino-2-ethyl)-pyridine]nickel(II)     [phenanthrene-9,10-diolate], -   [2-(N-(2,6-di-iso-propylphenyl)-1-imino-2-ethyl)-pyridine]nickel(II)     [phenanthrene-9,10-diolate], -   [2-(N-(2,6-diethylphenyl)-imino-2-ethyl)-pyridine]nickel(II)     [phenanthrene-9,10-diolate], -   [2-(N-(2,4,6-trimethylphenyl)-imino-2-ethyl)-pyridine]nickel(II)     [phenanthrene-9,10-diolate], and -   [2-(N-(2,6-di-iso-propyl-4-methylphenyl)-1-imino-2-ethyl)-pyridine]nickel(II)     [phenanthrene-9,10-diolate].

A similar list of platinum, palladium, nickel, iron, copper and cobalt complexes can be generated using the above list by substituting “nickel(II)” with platinum(II), palladium(II), iron(II), copper(I), cobalt (I) or cobalt(II). For example, [2-(N-(2,6-dimethylphenyl)-iminomethyl)-pyridine]nickel(II) [3,6-di-tert-butyl-catecholate], would become:

-   [2-(N-(2,6-dimethylphenyl)-iminomethyl)-pyridine]platinum(II)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2,6-dimethylphenyl)-iminomethyl)-pyridine]palladium(II)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2,6-dimethylphenyl)-iminomethyl)-pyridine]iron(II)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2,6-dimethylphenyl)-iminomethyl)-pyridine]copper(I)     [3,6-di-tert-butyl-catecholate], -   [2-(N-(2,6-dimethylphenyl)-iminomethyl)-pyridine]cobalt(I)     [3,6-di-tert-butyl-catecholate], or -   [2-(N-(2,6-dimethylphenyl)-iminomethyl)-pyridine]cobalt(II)     [3,6-di-tert-butyl-catecholate].

In this list, the transition metal compounds of nickel(II) and palladium(II) are most preferred.

Experimental—Synthesis of Pre-catalysts

In the following experiments pressure is reported in atomspheres and pounds per square inch. The conversion factors to S. I. Units are; 1 psi equals 6.894757 kPa and 1 atm equals 101.325 kPa.

All experiments were performed under an inert atmosphere unless otherwise specified. Solvents, including NMR solvents were dry and deaerated prior to use. Dicobalt octacarbonyl was purchased from Strem Chemical Company. Nickel carbonyl can also be obtained from Strem Chemical Company. 1,4-bis-(2,6-di-isopropylphenyl)-1,4-diaza-1,3-butadiene and [1,4-bis-(2,6-di-isopropylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) dibromide (Ni—Br) were prepared according to literature methods or as described in the experiment (J. Am. Chem. Soc. 1995, 117, 6414 or U.S. Pat. No. 5,880,323). 2,6-bis[1-(2,4,6-trimethylphenylimino)ethyl]pyridine and N,N′-(2,6-pyridinediyldiethylidyne)bis(2,4,6-trimethylbenzenamine]cobalt(II) dichloride (Co—Cl) were synthesized according to literature methods (J. Am. Chem. Soc. 1999, 121, 8728. 2,6-bis[1-(2-methylphenylimino)ethyl]pyridine was purchased from Strem Chemical Company. Titanium tetrachloride, pyrocatechol (catechol), 3,5-di-tert-butyl-o-quinone, isobutylene, silver(I) oxide, thallium (dried), mercury, glyoxal (40 wt. % solution in water), pyruvic aldehyde (40 wt.% solution in water), 2,3-hexanedione, 2,3-butanedione (diacetyl), 2-acetylpyridine, 2-pyridinecarboxaldehyde, 2,6-dimethylaniline, 2,6-di-isopropylaniline, 2,5-di-tert-butylaniline, 2-isopropyl-6-methylaniline, diethylamine, formic acid, anhydrous magnesium sulfate, anhydrous sodium sulfate, sulfryl chloride, sodium acetate, manganese(II) acetate, nickel(II) dibromide ethylene glycol dimethyl ether complex ((DME)NiBr₂), can be purchased from Aldrich Chemical Company.

Elemental analyses were performed by pyrolysis in closed zone in oxygen stream at 900° C. Determination accuracy for C, H was about 0.3%. NMR spectra of ligands and transition metal complexes were recorded on a Tesla BS-567 A 100 MHz ¹H NMR, a Gemini-300 300 MHz ¹H NMR, or on a Bruker DPX 200 ¹H NMR 200 MHz; ¹³C NMR 50.3 MHz). IR-spectra were recorded on Specord-M80 (Nujol, cm⁻¹).

3,6-di-tert-butyl-catechol: A mixture of freshly distilled TiCl₄ (11 g, 58 mmol) and pyrocatechol (13.7 g, 0.124 mol) was refluxed in 80 mL of xylene during 20 hours. The resulting dark-brown solid was filtered, washed by xylene and dried under vacuum. Titanium catecholate (10.24 g, 66%) was isolated. This salt (2.3 g, 8.7 mmol), pyrocatechol (82.5 g, 0.749 mol), xylene (80 mL) and isobutylene (150 mL) were heated in autoclave during 1.5 hours at 140° C. The solvent was removed and the residue was distilled under vacuum (b.p. −140-145° C., ˜1 mm Hg; m.p. 96-96.5° C.). Yield: 157.4 g (95%). (Also see “Organic Chemistry of Free Radicals”, Moscow, Khimia, 1979, p. 134.)

3,6-di-tert-butyl-1,2-benzoguinone: To 3,6-di-tert-butylcatechol (0.222 g, 1.0 mmol) dissolved in 50 mL ether, Ag₂O powder (1.2 g, excess) was added. The mixture was intensively stirred for one hour, and was then allowed to sit a few minutes. The green solution was carefully decanted off; the residue was washed with ether (3×10 mL). Combined solutions were filtered, and partly evaporated to reduce volume. Upon cooling, red-green crystals were formed, and were isolated by filtration. The yield was close to quantitative; m.p. 199-201° C. (Also see “Organic Chemistry of Free Radicals”, Moscow, Khimia, 1979, p. 134.)

(3,6-di-tert-butyl-catecholate) dithallium: An evacuated ampoule containing 3,6-di-tert-butyl-1,2-benzoquinone (0.22 g, 1 mmol) and thallium amalgam (great excess, approx. 10-20:1 molar excess) in tetrahydrofuran (“THF”) (˜50 mL) was strongly shaken until the color became unchanged. (The color changed from deep red-brown to bright yellow.) The light suspension of thallium catecholate was carefully decanted from thallium amalgam. Amalgam was washed by THF till the disappearance of color. Thallium catecholate was used in situ. The compound was extremely air sensitive.

3,6-di-tert-butyl-4-methoxy-o-quinone: To 3,6-di-tert-butyl-o-quinone (11 g, 0.05 mol) in 100 mL of methanol were added dry manganese(II) acetate (4.4 g, 0.025 mol) and dry sodium acetate (0.5 g). The mixture was stirred. During this time, the color changed from red to brown. The reaction progress was monitored by thin-layer chromatography using “Silufol” plates (Silufol UV 254 from Kavalier in the Czech Republic). Eluent: n-hexane/ether (100/1). Upon reaction completion, the mixture was filtered, methanol was removed, and the solid residue was recrystallized from n-hexane. The product was isolated as dark-red plates; m.p. 98° C., yield 78%. (Also see Izv.Acad.Nauk SSSR, Ser.Khim., 12 (1980) 2707.)

3,6-di-tert-butyl-4,5-di-methoxy-o-quinone: This compound was obtained similarly to 3,6-di-tert-butyl-4-methoxy-o-quinone. Additionally, air was bubbled into the mixture to help promote the reaction of the 3,6-di-tert-butyl-4-methoxy-o-quinone (initial product formed) to the 3,6-di-tert-butyl-4,5-di-methoxy-o-quinone. According to thin-layer chromatography, the maximum concentration of the product was achieved after about 7 days. The solvent was removed; the solid residue was dissolved in n-hexane/ether (100/1) mixture and separated through silica-gel column (Silochrome C-1 20, 0.25-0.35 mm, from Reachim in Russia). Eluent: n-hexane/ether (100/1). The bright red zone was isolated and concentrated. After cooling bright-red needle-like crystals were obtained; m.p. 76-77° C., yield 35%. ¹H NMR (CD₃Cl, (200 MHz, δ, ppm): 1.3 s (18H, Bu^(t)); 3.77 s (6H, OCH₃).

3,6-di-tert-butyl-4-chloro-o-quinone: SO₂Cl₂ (25 mmol) was slowly added to a chilled solution of 3,6-di-tert-butyl-o-quinone (10 mmol) in 15 mL of ether. The reaction was exothermic, hence, the reaction was chilled using a cold water bath to maintain the reaction at or near room temperature. The reaction mixture was stirred until the quinone color disappeared, and then was washed with aliquots of water until neutral, and dried over Na₂SO₄. The dried solution was separated from the Na₂SO₄. The ether was removed, and the solid residue was recrystallized from n-heptane. Light-yellow crystals of 3,6-di-tert-butyl-5,6-dichloro-cyclohex-3-ene-dione-1,2 were isolated. The mentioned product (10 mmol) was mixed with Et₂NH (12 mmol) in n-pentane. The formed residue (Et₂NH₂ ⁺Cl⁻) was removed, and the mother solution was allowed to sit for one hour. The solution was then washed with aliquots of water until neutral, and dried over Na₂SO₄. The dried solution was separated from the Na₂SO₄. Upon partial evaporation and cooling, deep-red crystals were formed; m.p. 50° C. ¹H NMR (CD₃Cl, (200 MHz, δ, ppm): 1.25 s (9H, Bu^(t)); 1.40 s (9H, Bu^(t)); 6.66 s (1H, arom.). (Also see Izv.Acad.Nauk SSSR, Ser.Khim., 12 (1985) 2793.)

3,6-di-tert-butyl-4,5-di-chloro-o-quinone: This compound was obtained similarly to 3,6-di-tert-butyl-4-chloro-o-quinone, using the same general reaction conditions and work-up/isolation techniques described above. 3,6-di-tert-butyl-4-chloro-o-quinone was reacted with excess SO₂Cl₂ in chilled ether to produce of 3,6-di-tert-butyl-4,5,6-trichloro-cyclohex-3-ene-dione-1,2 which was isolated in a manner analogous to of 3,6-di-tert-butyl-,5,6-dichloro-cyclohex-3-ene-dione-1,2 described above. This product was reacted with a slight excess of Et₂NH in pentane. The formed residue (Et₂NH₂ ⁺Cl⁻) was removed. The solution was then washed with aliquots of water until neutral, and dried over Na₂SO₄. The dried solution was separated from the Na₂SO₄. Partial evaporation and cooling produced a solid that was recrystallized from n-hexane at 0° C. Deep-red crystals; m.p. 48° C. ¹H NMR (CD₃Cl, (200 MHz, δ, ppm): 1.41 s (18H, Bu^(t)).

Nickel Complexes: General synthetic procedure for compounds Ni-1, Ni-2, Ni-3, Ni-4 and Ni-5: Nickel tetracarbonyl (0.171 g, 1 mmol) was condensed into an evacuated ampoule (approximately 200 mL volume) containing the corresponding 1,2-benzoquinone (1 mmol) and diazabutadiene (1 mmol) in 20 mL of degassed toluene. The ampoule was slowly warmed at about 30° C. for one half hour and at about 80° C. for the next two hours. During this period, it was necessary to freeze and evacuate the ampoule periodically every ten minutes to remove CO (a side product of the reaction). After this time period, the resulting solution was allowed to stay overnight at −10° C. in the ampoule. Crystalline solid was filtered, washed with light petroleum ether and dried under vacuum. Yields and compound properties are listed below.

Ni-1 [1,4-bis-(2,6-di-isopropylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butylcatecholate]

The general procedure described above yielded dark green air stable crystals. Yield 0.426 g (65%). IR (Nujol, cm⁻¹): 1590 w, 1550 w, 1370 m, 1360 m, 1320 s, 1305 s, 1275 s, 1260 s, 1210 s, 1180 s, 1040 s, 985 s, 940 m, 870 m, 860 m, 785 s, 750 s, 700 s, 655 s, 620 m, 595 m, 5 15 m, 490 w. Anal.(%) Found: C 72.94; H 8.79; Ni 8.95. C₄₀H₅₆N₂O₂Ni Calc.: C 73.28; H 8.55; Ni 9.01. The complex was soluble in THF, CH₂Cl₂ and Et₂O, was moderately soluble in toluene, and was insoluble in light petroleum ether.

Ni-2 [1,4-bis-(2,6-di-isopropylphenyl)-1,4-diaza-1,3-butadienel nickel(II) [3,6-di-tert-butyl-4,5-dichlorocatecholate]

The general procedure described above yielded dark green, air stable crystals. Yield 0.47 g (65%). IR (Nujol, cm⁻¹): 1590 w, 1565 w, 1545 w, 1400, 1370 s, 1330 s, 1305 m, 1260 s, 1240 s, 1220 s, 1180 s, 1035 s, 990 m, 865 m, 850 m, 800 m, 755 m, 700 m, 670, 600, 515. The complex was soluble in THF, CH₂Cl₂, Et₂O and toluene, and was insoluble in light petroleum ether.

Ni-3 [1,4-bis-(2,6-di-isopropylphenyl)-1,4-diaza-1,3-butadienel nickel(II) [3,6-di-tert-butyl-4,5-dimethoxycatecholate]

The general procedure described above yielded brown-green, air stable crystals. Yield 0.5 g (70%). IR (Nujol, cm⁻¹):1560 w, 1530 w, 1500, 1395, 1370 s, 1330 m, 1285 s, 1230 s, 1180 s, 1150 m, 1115 m, 1090, 1045 s, 1025 m, 1005 m, 885 m, 870 m,760, 730 s, 705 m, 690 m, 600 w, 575 w, 5 15 m. The complex was soluble in THF, CH₂Cl₂, Et₂O and toluene, and was insoluble in light petroleum ether.

Ni-4 [1,4-bis-(2,6-di-isopropylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,5-di-tert-butylcatecholate]

The general procedure described above yielded yellow-green crystals. Yield 0.265 g (40%). IR (Nujol, cm⁻¹): 1590 m, 1530 m, 1475 vs, 1440 s, 1400,1365 s, 1360 s, 1325 s, 1300 s, 1250 m, 1205 m, 1180 s, 1110,1060 m, 1040 s, 1025, 990, 920, 870 m, 845, 830, 800, 760 m, 705, 660, 605, 525. The complex was soluble in THF, CH₂Cl₂, toluene, and was moderately soluble in light petroleum ether.

Ni-5 [2,3-dimethyl-1,4-bis-(2,6-di-isopropylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butylcatecholate]

The general procedure described above yielded dark green, air stable crystals. Yield 0.546 g (80%). IR (Nujol, cm⁻¹): 1595 w, 1580 w, 1505 s, 1405 s, 1370 m, 1345 s, 1320 s, 1305 s, 1275 s, 1215 s, 1065 w, 985 s, 950 m, 890 w, 880 w, 835 w, 785 m, 740 m, 7 15 w, 705 w, 655 620 m, w, 5 15 w. The complex was soluble in THF, CH₂Cl₂, Et₂O and toluene, and was insoluble in light petroleum ether.

Ni-6 [1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-catecholate]from [1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) dibromide and (3,6-di-tert-butyl-catecholate)dithallium

A glyoxal solution (9.5 mL, 40 wt. % in water, 0.08 mol) was slowly added at 0° C. to a stirring solution of 20 mL (0. 16 mol) 2,6-dimethylaniline in 50 mL of methanol containing two drops of formic acid as a catalyst. The mixture was stirred four hours and cooled. The crystalline product was filtered, washed with methanol and dried in air. After recrystallization from n-heptane, yellow crystals of 1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene were obtained. Yield 12.8 g (60%). M.p. 153-155° C. Anal. (%) Found: C 81.51; H 7.41; C₁₈H₂₀N₂ Calc.: C 81.82; H 7.58. ¹H NMR (CDCl₃, 67 , ppm): 2.17 s (12 H, CH₃Ph), 6.96-7.01 m (2H, p-CH(Ph)), 7.06-7.10 d (4H, m-CH(Ph)), 8.11 s (2H, —CH═N—). IR (Nujol): v(C═N) 1630 cm⁻¹.

A solution of 1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene (0.27 g, 1.0 mmol) in 20 mL THF was added to (DME)NiBr₂, (0.31 g, 1.0 mmol) suspended in 20 mL THF. The reaction mixture was warmed at about 60° C. over one day until the precipitate disappeared. Deep-brown crystals were filtered, washed with cold, light petroleum ether, and dried in vacuum. Yield 0.29 g (60%). IR (Nujol, cm⁻¹): v(C═N) 1630 cm⁻¹.

To 0.48 g (1 mmol) of [1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) dibromide in 20 mL THF, a suspension of (3,6-di-tert-butyl-catecholate)dithallium in 20 mL THF was added. The mixture was refluxed for one hour. The solvent was then changed to CH₂Cl₂/hexane (1/1). The solution was filtered, reduced in volume, and chilled for 10 hours. The resulting dark green solid was filtered, washed with cold hexane, and dried in vacuum. Yield 0.30 g (55%). Anal.(%) Found: C 71.50; H 7.81; Ni 10.56. C₃₂H₄₀N₂0₂Ni Calc.: C 70.73; H 7.42; Ni 10.80. IR(Nujol, cm⁻¹): 1720, 1600, 1555, 1460, 1360, 1320 s, 1305 s, 1245, 1205 s. The complex was air stable, and was soluble in THF, CH₂Cl₂, and was slightly soluble in toluene.

Ni-6 [1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadienel nickel(II) [3,6-di-tert-butyl-catecholate]from [1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadienel, 3,6-di-tert-butyl-1,2-benzoguinone and nickel tetracarbonyl

Nickel-tetracarbonyl (0.704 g, 4.12 mmol) was condensed into evacuated frozen ampoule (of approximately 500 mL volume) containing 1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene (1.056 g, 4.0 mmol) and of 3,6-di-tert-butyl-1,2-benzoquinone (0.88 g, 4.0 mmol) in 100 mL of degassed THF. The ampoule was carefully warmed at ˜30° C. for one half hour, and at ˜60° C. for the next two hours. It was necessary to freeze and evacuate the ampoule periodically for removing CO. Afterwards, the solvent was removed. The solid residue was recrystallized from mixture light petroleum ether/CH₂Cl₂ (˜2 to 1), yielding 0.43 g (65%) of product. ¹H NMR (200 MHz, CDCl₃, δ, ppm): 0.94 s (18 H, C(CH₃)₃); 2.48 s (12 H, (CH₃)); 6.22 s (2H, Ar-Cat); 7.14-7.27 m (6H, C₆H₃); 7.88 s (2H, —CH═N—).

Ni-7 [2,3-dimethyl-1,4-diphenyl-1,4-diaza-1,3-butadienel nickel(II) [3,5-di-tert-butyl-catecholate]

A diacetyl solution (4.4 mL, 0.05 mol in 10 mL MeOH) was slowly added at 0° C. upon stirring to the solution of 10.0 mL (0.11 mol) aniline in 50 mL of methanol containing two drops of formic acid. The mixture was stirred twenty hours and cooled down to −20° C. The crystalline product, 2,3-dimethyl-1,4-diphenyl-1,4-diaza-1,3-butadiene, was filtered, washed with cold methanol and dried in air. After recrystallization from n-heptane yellow crystals were obtained. Yield 7.5 g (63.5%). IR (Nujol, cm⁻¹): 1640 m, 1600, 1485, 1410 m, 1365 m, 1215, 1120, 1080, 905, 815, 765 s, 700 s. ¹H NMR (200 MHz, CDCl₃, δ, ppm): 2.15 s (6H, CH₃); 6.79 d (4H, J=7.3 Hz, 2-H); 7.11 t (J=7.4 Hz, 4-H); 7.37 t (4H, J=7.5 Hz, 3-H). 13C NMR (50 MHz, CDCl₃, δ, ppm): 15.40 (—CH₃); 118.75 (2-CH); 123.83 4-CH); 128.99 (3-CH); 150.94 (1-C); 168.29 (C═N).

Nickel tetracarbonyl (0.86 g, 5 mmol) was condensed into an evacuated ampoule (having reserved volume of approximately 1 litre) and containing frozen 2,3-dimethyl-1,4-diphenyl-1,4-diaza-1,3-butadiene (1.11 g, 5 mmol) and 3,5-di-tert-butyl-1,2-benzoquinone (1.10 g, 5 mmol) in 100 mL of degassed toluene. The ampoule was slowly warmed at ˜30° C. for one hour and at ˜60° C. for the next two hours. Resulting solution was maintained at −10° C. overnight. Dark green crystals were filtered, washed with light petroleum ether, and dried under vacuum. Yield 1.826 g (65%). IR (Nujol, cm⁻¹): 1585, 1515 m, 1490 m, 1420, 1390, 1340 m, 1300 s, 1265 m, 1250, 1215, 1075, 985 s, 850 m, 830, 765 s, 730, 695 s, 655, 625, 525. ¹H NMR (200 MHz, CDCl₃, δ, ppm): 0.94 and 1.11 s (2×9H, C(CH₃)₃); 1.78 s (6H, N═CCH₃); 7.27-7.50 m (10H, 2×C₆H₅).

Ni-8 [2-methyl-1,4-bis(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-catecholate]

A pyruvic aldehyde water solution (12 mL, 40 wt. %, 78 mmol) was dropwise added to a methanol (50 mL) solution of 2,6-dimethylaniline (20 g, 165 mmol) and 0.5 mL formic acid with stirring. Light petroleum ether (100 mL) was then added, and the mixture was stirred for 4 hours. The petroleum ether layer was separated, partly evaporated and cooled. The yellow solid was recrystallized from n-hexane to give the yellow crystalline product, 2-methyl-1,4-bis(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene (4.8 g, 22%). ¹H NMR (200 MHz, CDCl₃, δ, ppm): 2.03 s (3H, N═CCH₃); 2.04 s (6H, 2′,6′-CH₃); 2.18 s (6H, 2,6-CH₃); 6.90-7.15 m (6H, 2×C₆H₃); 8.05 s (1 H, N═CH). ¹³C NMR (50.3 MHz, CDCl₃, δ, ppm): 15.16 (N═CCH₃); 17.90 and 18.35 (2,6- and 2′,6′-CCH₃); 123.77 and 124.61 (4- and 4′-CH); 124.84 and 126.64 (2,6- and 2′,6′-C); 148.21 and 149.76 (1- and 1′-C); 164.67 (N═CH); 167.97 (N═CMe).

To a frozen solution of 2-methyl-1,4-bis(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene (0.331 g, 1.19 mmol) and 3,6-di-tert-butyl-1,2-benzoquinone (0.262 g, 1.19 mmol) in 30 mL of THF in an evacuated ampoule, Ni(CO)₄ (2.03 g, 1.19 mmol) was condensed. The mixture was warmed at 60° C. during a two hour period with CO periodically being removed. After this time period, the THF was removed leaving behind a solid residue which was dissolved in toluene. The slow addition of n-hexane lead to the formation of a green microcrystalline solid which was isolated by filtration. The product yield was 0.31 g (46.8%). ¹H NMR (200 MHz, CDCl₃, δ, ppm): 1.25 s (18H, 2×C(CH₃)₃); 1.6 s (3H, N═CCH₃); 2.44 s (6H, 2,6-CH₃); 2.50 s (6H, 2′,6′-CH₃); 6.18 s (2H, 4,5-H), 7.15-7.22 m (6H, 2×(3,4,5-H); 7.88 s (1H, N═CH).

Ni-9 [2-methyl-3-propyl-1,4-bis(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-catecholate]

2,3-Hexanedione (4.0 mL, 33 mmol) was slowly added to the mixture of 2,6-dimethylaniline (10 g, 80 mmol) and 0.2 mL formic acid in 25 mL of methanol. The mixture was stirred for 6 hours. After this time period, the solvent and excess of aniline were removed under vacuum. The residual viscous oil was dissolved in n-pentane and cooled to give a yellow solid which was recrystallized from n-pentane. The product, 2-methyl-3-propyl-1,4-bis(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene was isolated as yellow crystals (1.9 g, 18%). ¹H NMR (200 MHz, CDCl₃, δ, ppm): 0.84 t (3H, J=7.28 Hz, (CH₂)₂CH ₃); 1.52 m (2H, CH₂CH ₂CH₃); 2.03 s (3H, N═CCH₃); 2.05 s and 2.06 s (6H and 6H, 2,6- and 2′,6′-CH₃); 2.50 m (2H, CH ₂CH₂CH₃); 6.89-7.15 m (6H, 2×C₆H₃). ¹³C NMR (50.3 MHz, CDCl₃, δ, ppm): 14.59 (CH₂CH₂ CH₃); 16.38 (N═CCH₃); 17.96 and 18.03 (0.2,6- and 2′, 6′-CCH₃); 20.28 (CH₂ CH₂CH₃); 31.24 (CH₂CH₂CH₃); 123.13 and 123.18 (4- and 4′-CH); 124.67 and 124.75 (2,6 and 2′,6′-C); 127.94 and 127.98 (3,5- and 3′,5′-CH); 147.99 (140 -C); 148.51 (1-C); 167.61 (N═CMe); 171.52 (N═CPr).

To a frozen solution of 2-methyl-3-propyl-1,4-bis(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene (0.412 g, 1.29 mmol) and 3,6-di-tert-butyl-1,2-benzoquinone (0.283 g, 1.29 mmol) in 30 mL of toluene in an evacuated ampoule, Ni(CO)₄ (2.2 g, 1.29 mmol) was condensed. The mixture was warmed at 80° C. during a two hour period with CO periodically being removed. After this time period, the toluene was removed, and the remaining residue was recrystallized from a mixture of CH₂Cl₂/light petroleum ether (˜1/1). A green microcrystalline solid was isolated (0.23 g, 30%).

¹H NMR (200 MHz, CDCl₃, δ, ppm): 0.86 m and 0.88 s (21H, CH₂CH ₂CH₃ and 2×C(CH₃)₃); 1.36 m (2H, CH₂CH ₂CH₃); 1.63 s (3H, N═CCH₃); 2.06-2.14 m (2H, CH ₂CH₂CH₃); 2.43 s and 2.47 s (6H and 6H, 2,6-CH₃); 6.14 s (2H, 4,5-H); 7.11-7.24 m (6H, 2×(3,4,5-H)).

Ni-10 [2,3-dimethyl-1-(2,6-di-isopropylphenyl)-4-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-catecholate]

Diacetyl (4.53 g, 52 mmol) was added dropwise to solution of 2,6-di-isopropyl-aniline (9.4 g, 52 mmol) in 50 mL light petroleum ether with stirring and in presence of MgSO₄ (anhydrous). Reaction was initiated by 3-5 drops of formic acid and carried out 8-10 hours. The reaction mixture was then filtered. All volatile components were evaporated from the filtrate under vacuum yielding the product, 3-(N-2,6-di-isopropylphenyl)imino-butanone-2, as a yellow oil. Yield 8.6 g (75%). ¹H NMR (200 MHz, CDCl₃, δ, ppm): 1.13 and 1.14 (d and d, 2×6H, CH(CH ₃)₂, J=6.9 Hz); 1.82 (s, 3H, CH₃); 2.59 (s, 3H, CH₃); 2.72 (sept, 2H, CHMe₂, J=6.9 Hz); 7.06-7.20 (m, 3H, C₆H₃).

2,6-Di-methylaniline (0.54 g 4.4 mmol) was added to solution of 3-(N-2,6-di-isopropylphenyl)imino-butanone-2 (1.1 g, 4.4 mmol) in 50 mL MeOH with stirring. Two drops of formic acid were added to initiate reaction which took place over three days. Volatile components were removed under vacuum producing the product, 2,3-dimethyl-1-(2,6-di-isopropylphenyl)-4-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene, as a yellow oil (0.71 g, 38%). ¹H NMR (200 MHz, CDCl₃, δ, ppm): 1.18 and 1.19 (d and d, 2×6H, CH(CH ₃)₂, J=6.9 Hz); 2.05 (s, 9H, CH₃C═N and Me₂Ar); 2.07 (s, 3H, CH₃C═N); 2.70 (sept, 2H, CHMe₂, J=6.9 Hz); 6.90-7.20 (m, 6H, i-Pr₂C₆H₃ and Me₂C₆H₃).

To a frozen solution of 2,3-dimethyl-1-(2,6-di-isopropylphenyl)-4-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene (0.602 g, 2.7 mmol) and 3,6-di-tert-butyl-1,2-benzoquinone (0.952 g, 2.7 mmol) in 70 mL of THF in an evacuated ampoule was condensed Ni(CO)₄ (0.468 g, 2.7 mmol). The mixture was allowed to stay for a night; CO was removed periodically. After this time period, the THF was removed leaving a residue. The residue was recrystallized from a mixture of CH₂Cl₂/n-hexane (˜1/1) and yielded the product as a green microcrystalline solid (1.52 g, 90%). ¹HNMR (200 MHz, CDCl₃, δ, ppm): 0.88 (s, 18H, C(CH₃)₃); 1.19 and 1.49 (d and d, 2×6H, CH(CH ₃)₂, J=6.8 Hz); 1.64 and 1.69 (s and s, 2×3H, CH₃C═N), 2.43 (s, 6H, (CH ₃)₂Ar); 3.34 (sept, 2H, CHMe₂); 6.13 (s, 2H, Ar-Cat); 7.06-7.42 (m, 6H, i-Pr₂C₆H₃ and Me₂C₆H₃).

Ni-11 [2,3-dimethyl-1-(2,6-di-isopropylphenyl)-4-(2,5-di-tert-butylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-catecholate]

2,5-Di-tert-butylaniline (0.92 g, 4.4 mmol) was added to solution of 3-(N-2,6-di-isopropylphenyl)imino-butanone-2 (1.1 g, 4.4 mmol) in 50 mL MeOH with stirring. Two drops of formic acid were added to initiate reaction which took place over two days. Volatile components were remove under vacuum, yielding the product, 2,3-dimethyl-1-(2,6-di-isopropylphenyl)-4-(2,5-di-tert-butylphenyl)-1,4-diaza-1,3-butadiene, as a yellow-brown oil (0.7.5 g, 49%). ¹H NMR (200 MHz, CDCl₃, δ, ppm): 1.18 (d, 12H, CH(CH ₃)₂, J=6.8 Hz); 1.33 (s, 18H, (CH₃)₃C); 2.07 and 2.20 (s and s, 2×3H, CH₃C═N); 2.72 (sept, 2H, CHMe₂, J=6.8 Hz); 6.55 (d, 1H, o-H, J=2.1 Hz); 7.06-7.20 (m, 4H, i-Pr₂C₆H₃ and p-H); 7.35 (d, 1H, m-H, J=8.2 Hz).

To a frozen solution of 2,3-dimethyl-1-(2,6-di-isopropylphenyl)-4-(2,5-di-tert-butylphenyl)-1,4-diaza-1,3-butadiene (1.1 g, 2.5 mmol) and 3,6-di-tert-butyl-1,2-benzoquinone (0.518 g, 2.3 mmol) in 70 mL of THF in an evacuated ampoule was condensed Ni(CO)₄ (0.403 g, 2.3 mmol). The mixture was allowed to stay for a night; CO was removed periodically. After this time period, THF was removed leaving a residue. The residue was recrystallized from mixture CH₂Cl₂/n-hexane (˜1/1) to yield the product as a green microcrystalline solid (1.13 g, 69%). ¹H NMR (200 MHz, CDCl₃, δ, ppm): 0.89 and 0.92 (s and s, C(CH₃)₃-Cat); 1.12, 1.24, 1.46 and 1.47 (all d, (CH ₃)₂CH, J=7 Hz); 1.36 and 1.60 (s and s, C(CH₃)₃-ArN); 1.69 and 1.72 (s and s, 2×3H, CH₃C═N); 3.23 and 3.61 (sept and sept, CHMe₂); 6.11 (s, 2H, Ar-Cat); 7.12 (d, 1H, o-H, J=2.2 Hz); 7.22-7.39 (m, 4H, i-Pr₂C₆H₃ and p-H); 7.46 (d, 1H, m-H, J=8.5 Hz).

Ni-12 2-(N-(2,6-dimethylphenyl)-iminomethyl)-pyridine nickel(II) [3,6-di-tert-butyl-catecholate]

A mixture of 2-pyridine-carboxaldehyde (10 ml, 0.1 mole), 2,6-dimethylaniline (12.9 ml, 0.1 mole), 3 drops of formic acid and 30 ml methanol was stirred for five hours. The methanol was removed under vacuum. An oil-like residue was recrystallized from n-hexane. 2-(N-(2,6-dimethylphenyl)-iminomethyl)-pyridine was isolated as yellow crystals. Yield: 13.6 g (62%). ¹H NMR (200 MHz; CDCl₃; δ, ppm; J, Hz): 2.17 s (6H, CH₃), 6.94-7.12 m (3H, C₆H₃), 7.39 d,d,d (1H, H(5) ³J_(4,5)=7.5, ³J_(5,6)=4.9, ⁴J_(3,5)=1.3); 7.83 t,d,d (1H, H(4) ³J=7.7, ⁴J_(4,6)=1.8, ⁵J=0.6); 8.28 d,t (1H, H(3) ³J_(3,4)=7.9, J=1.1); 8.35 s (1H, HC═N); 8.71 d,d,d (1H, H(6) ³J_(5,6)=4.9, ⁴J_(4,6)=1.6, ⁵J_(3,6)=1.0). ¹³C NMR, DEPT (50 MHz; CDCl₃; δ, ppm): 18.3 (CH₃), 121.2 (C(3)H), 124.0 (C(4′)H), 125.3 (C(5)H), 126.8 (C(2′,6′)), 128.1 (C(3′,5′)H), 136.7 (C(4)H), 149.6 (C(6)H), 150.3 (C(1′)), 154.4 (C(2)), 163.4 (HC═N).

Equimolar amounts of 3,6-di-tert-butylquinone (0.18 g, 0.83 mmol), 2-(N-(2,6-dimethylphenyl)-iminomethyl)-pyridine (0.17 g, 0.83 mmol) and nickel tetracarbonyl (0.143 g, 0.83 mmol) were combined in a frozen evacuated ampoule. THF (˜50 mL) was condensed in the ampoule. The mixture was carefully warmed. Gas (CO) evolution was observed. The ampoule was periodically frozen and evacuated to remove evolved CO gas. After there was no longer any evolution of CO, the solvent was removed. The remaining residue was recrystallized from CH₂Cl₂/n-hexane (1/2) giving 0.21 g of the dark blue colored product (52.5% yield). ¹H NMR (200 Mz, CDCl₃, δ, ppm; J, Hz): 0.89 and 1.46 s (9H, C(CH₃)₃); 2.50 s (6H, Ar(CH₃)₂); 6.21 m (2H, O₂C₆ H ₂(Bu^(t))₂, J=8.0 Hz); 7.05-7.22 m (3H, (3′)H, and (5′)H); 7.56 d (1H, (3)H, ³J_(3,4)=7.8 Hz); 7.65 t (1H, (5)H, ³J=6.6 Hz); 7.96 t,d (1H, (4)H, ³J=7.8 Hz, J=1.5 Hz); 8.00 s (1H, HC═N); 9.16 d (1H, (6)H, ³J_(5,6)=5.5 Hz). ¹³C NMR (50 MHz, CDCl₃, δ, ppm): 18.7 (Ar(CH₃)₂); 28.9 and 29.9 (C(CH₃)₃); 33.3 and 33.8 (CMe₃); 111.2; 112.0; 125.0; 126.7; 127.1; 128.0 ((3′)C and (5′)C); 130.4 ((2′C and (6′)C); 133.6; 134.1; 137.4; 145.9; 150.4; 152.5; 159.4; 160.4; 160.8.

Ni-13 2-(N-(2-iso-propyl-6-methylphenyl)-iminomethyl)-pyridine nickel(II) [3,6-di-tert-butyl-catecholate]

A mixture of 2-pyridine-carboxaldehyde (8.5 ml, 0.052 mole), 2-iso-propyl-6-methylaniline (5 ml, 0.052 mole), 3 drops of formic acid and 30 ml methanol was stirred for five hours. The methanol was removed under vacuum. An oil-like residue was recrystallized from n-hexane. 2-(N-(2-iso-propyl-6-methylphenyl)-iminomethyl)-pyridine was isolated as yellow crystals. Yield: 10.25 g (82.8%). ¹H NMR (200 MHz; CDCl₃; δ, ppm; J, Hz): 1.18 d (6H, CH(CH ₃)₂, J=6.9), 2.15 s (3H, CH₃), 3.03 sept. (1H, CHMe₂, J=6.9), 701-7.21 m (3H, C₆H₃), 7.41 d,d,d (1H, H(5) ³J_(4,5)=7.5, ³J_(5,6)=4.9, ⁴J_(3,5)=1.3); 7.85 t,d,d (1H, H(4) ³J=7.7, ⁴J_(4,6)=1.8, ⁵J=0.6); 8.28 d,t (1H, H(3) ³J_(3,4)=7.9, J=1.1); 8.33 s (1H, HC═N); 8.73 d,d,d (1H, H(6) ³J_(5,6)=4.9, ⁴J_(4,6)=1.6, ⁵J_(3,6)=1.0). ¹³C NMR, DEPT (50 MHz; CDCl₃; δ, ppm): 18.6 (CH₃), 23.3 (CH(CH₃)₂), 27.9 (CHMe₂), 121.3 (C(3)H), 123.2 and 124.3 (C(3′)H and C(5′)H), 125.4 (C(5)H), 126.1 (C(6′)Me), 128.0 (C(4′)H), 136.7 (C(4)H), 137.9 (C(2′)i-Pr), 149.3 (C(1′)), 149.7 (C(6)H), 154.4 (C(2)), 163.4 (HC═N).

Equimolar amounts of 3,6-di-tert-butylquinone (0.668 g, 3.0 mmol. 2-(N-(2-iso-propyl-6-methylphenyl)-iminomethyl)-pyridine (0.809 g, 3.0 mmol) and nickel tetracarbonyl (0.52 g, 3.0 mmol) were combined in a frozen evacuated ampoule. THF (˜150 mL) was condensed in the ampoule. The mixture was carefully warmed. Gas (CO) evolution was observed. The ampoule was periodically frozen and evacuated to remove evolved CO gas. After there was no longer any evolution of CO, the solvent was removed. The remaining residue was recrystallized from THF giving 0.85 g of the dark blue colored product (54.8% yield). ¹H NMR (200 Mz, CDCl₃, δ, ppm): 0.90 and 1.47 both s (9H, C(CH₃)₃); 1.17 and 1.41 both d (3H, CH ₃CHCH₃ and CH₃CHCH ₃, J=6.9 Hz); 2.58 s (3H, (6)CCH₃); 3.44 sept (1H, CHMe₂, J=6.9 Hz); 6.22 m (2H, O₂C6H₂(t-Bu)₂, J=8.3 Hz); 7.05-7.31 m (3H, (3′,4′ and 5═)H); 7.60 d (1H, (3)H, ³J_(3,4)=7.6); 7.65 t (1H, (5)H, ³J=5.9); 7.97 t,d (1H, (4)H, ³J=7.8, J=1.4); 8.01 s (1H, HC═N); 9.19 d (1H, (6)H, ³J_(5,6)=5.4). ¹³C NMR DEPT (50 Mz, CDCl₃, δ, ppm): 19.2, 24.7 and 28.5 (CH₃), 29.1 and 29.9 (C(CH₃)₃), 31.6 (CMe₂), 33.3 and 33.8 (CMe₃), 111.2 (CH), 111.9 (CH), 123.4 (CH), 124.9 (CH), 126.6 (CH), 127.5 (CH), 127.7 (CH), 130.7, 133.5, 134.2, 137.4 (CH), 140.5, 144.7, 150.5 (CH), 152.4, 159.5, 160.5, 160.6 (HC═N).

Ni-14 2-(N-(2,5-di-tert-butylphenyl)-1-imino-2-ethyl)-pyridine nickel(II) [3,6-di-tert-butyl-catecholate]

An evacuated ampoule containing 2.46 g (12.0 mmole) 2,5-di-tert-butylaniline and 1.5 ml (excess 20%) 2-acetylpyridine was heated at 150° C. for five hours. After removal of H₂O, a yellow-brown oil-like product was obtained. According to ¹H NMR spectrum it contains ˜25% of the initial acetylpyridine. Because we were unable to isolate a pure final product, the mixture was used in the next step. Yield: 2.3 g (62%) calculated based on pure product. ¹H NMR (200 MHz; CDCl₃; δ, ppm; J, Hz): 1.30 and 1.35 s (9H, t-Bu); 2.37 s (3H, H₃CC═N); 6.55 s (1H, (6′)H); 7.09 d (1H, (4′)H, ³J=8.3); 7.28-7.37 m (2H, (3′)H and (5)H); 7.76 t (1H, (4)H, J=7.6); 8.34 d (1H, (3)H, J=7.8); 8.66 d (1H, (6)H, J=3.8).

Equimolar amounts of 3,6-di-tert-butylquinone (1.142 g, 5.2 mmol), 2-(N-(2,5-di-tert-butylphenyl)-1-iminoethyl)-pyridine (2.15 g, 5.2 mmol) and nickel tetracarbonyl (0.888 g, 5.2 mmol) were combined in a frozen evacuated ampoule. THF (˜150 mL) was condensed in the ampoule. The mixture was carefully warmed. Gas (CO) evolution was observed. The ampoule was periodically frozen and evacuated to remove evolved CO gas. After there was no longer any evolution of CO, the solvent was removed. The remaining residue was recrystallized from ether giving 2.2 g of the dark blue colored product (72% yield). ¹H NMR (δ, ppm): 0.91, 1.29, 1.45 and 1.61 all s (9H, C(CH₃)₃); 1.21 t (6H, O(CH₂CH ₃)₂, J=7.0); 2.01 s (3H, H₃CC═N); 3.48 q (4H, O(CH ₂Me)₂, J=7.0 Hz); 6.18 m (2H, O₂C₆H₂(t-Bu)₂, J=8.2 Hz); 6.99 d (1H, (6′)H, ⁴J=2.0); 7.31 d,d (1H, (4′)H, ³J=8.5, ⁴J=2.0); 7.41 d (1H, (3′)H, ³J=8.5); 7.53-7.64 m (2H, (3 and 5)H); 7.96 t (1H, (4)H, ³J=7.8); 9.11 d (1H, (6)H, ³J_(5,6)=5.4). ¹³C NMR DEPT (50 MHz, CDCl₃, δ, ppm): 15.3 (O(CH₂ CH₃)₂); 17.8 (CH₃C═N); 29.7, 29.8, 31.3 and 32.6 (all C(CH₃)₃); 33.2, 33.7, 34.3 and 35.7 (all CMe₃); 65.9 (O(CH2CH3)2); 110.6 (CH), 111.3 (CH); 120.7 (CH); 123.5 (CH); 124.3 (CH); 126.5 (CH); 128.1 (CH); 133.1; 133.7; 137.6 (CH); 138.2; 143.7; 149.3; 150.3 (CH); 153.7; 159.4; 160.8; 168.2.

Ni-15 2-(N-(2,6-dimethylphenyl)-1-imino-2-ethyl)-pyridine nickel(II) 13,6-di-tert-butyl-catecholate]

An evacuated ampoule containing 5.3 ml (0.043 mole) 2,6-dimethylaniline and 5.8 ml (excess 20%) 2-acetylpyridine was heated at 150° C. for five hours. After removal of H₂O, a yellow oil was obtained. According to ¹H NMR spectrum it contains ˜25% of the initial acetylpyridine. Because we were unable to isolate a pure final product, the mixture was used in the next step. Yield: 2.4 g (25%) calculated based on pure product. ¹H NMR (200 MHz, CDCl3, δ, ppm): 2.03 s (6H, CH3); 2.17 s (3H, H3CC═N); 6.89-7.08 m (3H, C6H3); 7.37 d,d,d (1H, (5)H, 3J4,5=7.5 Hz, 3J5,6=5.0, 4J3,5=1.0); 7.79 t,d (1H, (4)H, 3J=7.8, 4J4,6=1.8); 8.37 d (1H), (3)H, 3J3,4=8.0 Hz); 8.67 d,m (1H, (6)H, 3J5,6=4.8 Hz).

Equimolar amounts of 3,6-di-tert-butylquinone (0.995 g, 4.5 mmol), 2-(N-(2,6-dimethylphenyl)-1-iminoethyl)-pyridine (1.01 g, 4.5 mmol) and nickel tetracarbonyl (0.773 g, 4.5 mmol) were combined in a frozen evacuated ampoule. THF (˜150 mL) was condensed in the ampoule. The mixture was carefully warmed. Gas (CO) evolution was observed. The ampoule was periodically frozen and evacuated to remove evolved CO gas. After there was no longer any evolution of CO, the solvent was removed. The remaining residue was recrystallized from CH₂Cl₂/n-hexane (1/2) using slow evaporation to give 1.56 g of the dark blue colored product (69% yield). ¹H NMR (200 MHz, CDCl₃, δ, ppm): 0.86 and 1.45 both s (9H, C(CH₃)₃); 1.94 s (3H, H₃C═N); 2.43 s (6H, Ar(CH₃)₂); 6.19 m (2H, O₂C₆H₂(Bu^(t))₂, ³J=8.4 Hz); 7.05-7.20 m (3H, (3′,4′ and 5′)H); 7.53 d (1H, (3)H, ³J_(3,4)=7.8 Hz); 7.62 t (1H, (5)H, ³J=6.6 Hz); 7.96 t (1H, (4)H, ³J=7.5 Hz); 9.13 d (1H, (6)H, ³J_(5,6)=5.3 Hz).

Co-1 N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4,6-trimethylbenzenamine]cobalt(I) [3,5-di-tert-butyl catecholate]

2,6-bis[1-(2,4,6-trimethylphenylimino)ethyl]pyridine (0.5 g, 1.26 mmol) was dissolved in 50 mL of toluene and chilled to approximately −30° C. To the chilled solution, 3,5-di-tert-butylcatechol (0.247 g, 1.26 mmol) was added. After stirring for 20 minutes, dicobalt octacarbonyl (0.215 g, 1.26 meq) was added. The resulting solution was allowed to stir at ambient temperature overnight. On the following day, the solution was heated at 40-50° C. for approximately 3 hours and then allowed to stir overnight at ambient temperature. This step was repeated a second day, after which the solvents were removed via vacuum, and approximately 100 mL of pentane was added. The solids were separated from the solution by decanting off the solution and filtering the resulting decanted solution. The pentane solution was reduced in volume and placed in the freezer at approximately −30° C. to induce crystallization. After filtration, 0.119 g of the purple product was collected. The filtrate was again reduced in volume and placed in the freezer. This step was repeated twice to yield an additional 0.090 and 0.012 g of product, respectively, for a total yield of 0.221 g.

Co-2 N,N′-(2,6-pyridinediyldiethylidyne)bis[2-methylbenzenamine]cobalt(I) [3,5-di-tert-butyl catecholate]

2,6-bis[1-(2-methylphenylimino)ethyl]pyridine (1.0 g, 2.93 mmol) was dissolved in 100 mL of toluene and was placed in a freezer at −30° C. for one hour to chill the solution. To the chilled solution, 3,5-di-tert-butylcatechol (0.575 g, 2.93 mmol) was added. After stirring for 5 minutes, dicobalt octacarbonyl (0.500 g, 2.93 meq) was added. The resulting solution was allowed to stir at ambient temperature for approximately two and a half days. The reaction flask was then placed in the freezer at −30° C. for 30 minutes to chill the reaction mixture. Afterwards, the contents were filtered, and the filtrate was reduced in volume and placed in the freezer at −30° C. After several days, no crystals formed, so the solvent (toluene) was completely removed via vacuum and 10 mL of pentane was added. Again the flask was stored for several days at −30° C. The contents of the flask were then filtered and washed with cold pentane. A yellow solid with flecks of green remained on the filter. Room temperature pentane was then used to wash the product into a fresh collection flask. The darker solid remained on the frit and a yellow solution was collected. The filtrate was placed in the freezer at −30° C., and a few days later was filtered, leaving behind a yellow solid that was washed with cold pentane and dried. A yellow solid (0.367 g) was isolated. The remaining filtrate was reduced in volume and placed back in the freezer. Repeating the filtration and washing step, an additional 0.115 g of product, for a total yield of 0.482 g.

Experimental—Preparation of Supported Pre-Catalysts

S-1 Supported [1,4-bis-(2,6-di-isopropylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butylcatecholate]

In a 50 mL round bottom flask with stir bar, 30 mg of [1,4-bis-(2,6-di-isopropylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butylcatecholate] and about 3 mL of toluene were added. To the solution, 3.0 g of 800° C. calcined 948 Davison silica was added. Approximately, an additional 10 mL of toluene was added to aid stirring. The mixture was stirred for two hours, after which time the volatiles were removed via vacuum. After all visible solvent was removed, the support material was set aside overnight. The following morning, the remaining volatiles were removed yielding 2.80 g of a pale green solid. Based on the yield, the loading level was calculated to be 16.3 μmol Ni-1/g silica.

S-2 Supported [1,4-bis-(2,6-di-isopropylphenyl)-1,4-diaza-1 3-butadiene]nickel(II) [3,6-di-tert-butylcatecholate]

The procedure for S-1 was followed except that the volatiles were removed by pumping on the flask overnight. A pale green solid was isolated (2.75 g). Based on the yield, the loading level was calculated to be 16.6 μmol Ni-1/g silica.

Experimental—Polymerizations

All pre-catalysts were used as toluene solutions unless otherwise mentioned. Solutions were prepared in a dry box containing an inert atmosphere. Anhydrous toluene (99.8% packaged under nitrogen in Sure/Seal™ bottles) used for pre-catalyst solutions or slurries was purchased from Aldrich Chemical Company and stored in the dry box over 4A mole sieves. Alternatively, the toluene used for preparing the pre-catalyst solution or slurries was the same as the toluene used as the reactor solvent. Additives, 2,5-di-tert-butyl-1,4-benzoquinone, 3,3′,5,5′-tetra-tert-butyldiphenylquinone, and 1,4-benzoquinone were purchased from Aldrich Chemical Company.

TMA (trimethyl aluminum, NEAT) was purchased from Akzo Nobel or Aldrich Chemical Company. Tris(perfluorphenyl) boron (A1, B(Pfp)₃, B(C₆F₅)₃) was purchased from Boulder Scientific Company or Strem Chemical Company. Dimethylanilinium tetrakis(perfluorophenyl)borate (A2, [DMAH][B(pfp)₄], [PhNMe₂H][B(C₆F₅)₄]) was purchased from Albemarle Corporation or Boulder Scientific Company. MAO (methylalumoxane, 10 wt % in toluene) was purchased from Albemarle Corporation. MAO (methylalumoxane, 30 wt % in toluene) was purchased from Albemarle Corporation and stored at −40° C. MMAO (modified methylaluminoxane, 7 wt % in heptene) was obtained from Akzo Nobel and has 25% of its methyl groups replaced with isobutyl groups.

For experiments 1-109, 390-396, and C1 to C19, polymerization grade ethylene was used and further purified by passing it through two series of 500 cc Oxyclear cylinders from Labclear (Oakland, Calif.) followed by a 500 cc column packed with aluminum oxide, Brockman I, from Aldrich Chemical Company. For experiments 110-389 and C20-C48, polymerization grade ethylene was used and further purified by passing it through series of columns: a 500 cc Oxyclear cylinder, followed by a 500 cc column packed with 3A mole sieves (Aldrich) and a 500 cc column packed with 5A mole sieves (Aldrich). For experiments 397-419 and C49-C53, ethylene was obtained from BOC (Scientific Grade 4.5, 99.995% purity) and used without further purification. For experiments using propylene, polymerization grade propylene was used and further purified by passing it through two 500 cc Oxyclear cylinders in series followed by a 500 cc column packed with aluminum oxide (Brockman I), and a 500 cc column of dried 13× mole sieves. For experiments using 1-hexene, the 1-hexene (from Alfa Aesar) was sparged with nitrogen to remove air and stored over 4A mole sieves. Comonomers, cyclopentene (cP), cyclohexene (cH), and norbomene (NB) were purchased from Aldrich Chemical Company and were distilled from CaH₂ and degassed prior to use.

The reactor solvent for experiments 1-396, and C1 to C48, was high purity, dry and deoxygenated toluene (from ExxonMobil Chemical) stored under nitrogen gas and used as supplied. The reactor solvent for experiments 397-426 and C49-C56, was toluene obtained from Aldrich Chemical Company as anhydrous grade in 18 L Pure-Pac™ containers and further dried by sequential passage through columns of A-2 activated alumina (LaRoche, 8×14 mesh) and Q-5 copper reactant (copper oxide on alumina, Engelhard CU-0226S, 14×20 mesh). For additional information on drying solvents, see A. B. Pangbom, M. A. Giardello, R. H. Grubbs, R. K. Rosen, F. J. Timmers, Organometallics 1996, 15, 1518.

For experiments 1-109, 390-396 and C1-C1 9, polymerizations were conducted in a 1 L stainless steel Zipperclave reactor equipped with a paddle stirrer, a temperature controller, an on-demand supply of ethylene regulated to maintain a constant reactor pressure, and a supply of dry high pressure nitrogen to maintain an inert atmosphere. Monomer and solvent, directly plumbed into the reactor, were passed through drying columns prior to entering the reactor unless indicated otherwise.

A typical polyethylene reaction (examples 1-89 and C1-C14) began by adding 400 mL of dry toluene and the indicated amount of 10 wt % methylalumoxane in toluene to the reactor vessel. Afterwards, the reactor was vented to reduce excess nitrogen pressure. The reactor was brought to the desired temperature, and the catalyst precursor, typically dissolved in dry toluene and contained in a catalyst addition tube, was flushed into the reactor using the desired ethylene differential pressure. The reaction was run for 15 minutes during which time ethylene was added semi-continuously as needed to maintain reactor pressure. After the 15 minute time period, the ethylene flow was discontinued. The reactor was quickly cooled and vented. The reactor contents were precipitated in methanol. The polymer was initially dried under a flow of air and then typically dried overnight in a vacuum oven at 90-100° C. The results of these polymerizations are summarized in Tables 1-6.

By way of example, a polypropylene reaction (examples 90-100) began by adding 250 mL of dry toluene and 10 wt % methylalumoxane in toluene to the reactor. The reactor was vented to reduce excess nitrogen pressure. Afterwards, 250 mL of propylene was added to the reactor and the reactor was heated to the desired reaction temperature. The catalyst precursor, dissolved in dry toluene contained in a catalyst addition tube, was flushed into the reactor using approximately 20 mL of dry toluene under nitrogen pressure. The reaction was run for 30 minutes at which time the reactor was quickly cooled and vented. The reactor contents were precipitated in methanol. The polymer was initially dried under a flow of air and then typically dried overnight in a vacuum oven at 90-100° C. The results of these polymerizations are summarized in Table 7.

By way of example, an ethylene/propylene copolymerization reaction (examples 101-104) began by adding 200 mL of dry hexane and 10 wt % methylalumoxane in toluene to the reactor. The reactor was vented to reduce excess nitrogen pressure. Afterwards, 300 mL of propylene was added to the reactor and the reactor was heated to the desired reaction temperature. The catalyst precursor, dissolved in dry toluene contained in a catalyst addition tube, was flushed into the reactor using the desired ethylene differential pressure. The reaction was run for 15 minutes at which time the reactor was quickly cooled and vented. The reactor contents were precipitated in methanol. The polymer was initially dried under a flow of air and then typically dried overnight in a vacuum oven at 90-100° C. The results of these polymerizations are summarized in Tables 8 and 9.

By way of example, an ethylene/1-hexene copolymerization reaction (examples 105-109) began by adding 350 mL of dry toluene and 10 wt % methylalumoxane in toluene to the reactor. The reactor was vented to reduce excess nitrogen pressure. Afterwards, 50 mL of I -hexene was cannulated into the reactor, and the reactor was heated to the desired reaction temperature. The catalyst precursor, dissolved in dry toluene contained in a catalyst addition tube, was flushed into the reactor using the desired ethylene differential pressure. The reaction was run for 15 minutes at which time the reactor was quickly cooled and vented. The reactor contents were precipitated in methanol. The polymer was initially dried under a flow of air and then typically dried overnight in a vacuum oven at 90-100° C. The results of these polymerizations are summarized in Tables 8 and 9.

By way of example, a supported polymerization reaction (examples 390-396) began by adding 400 mL of dry toluene and 10 wt % methylalumoxane in toluene to the reactor. The reactor was vented to reduce excess nitrogen pressure. Afterwards, the reactor was heated to 40° C. The supported catalyst precursor contained in a catalyst addition tube, was flushed into the reactor using the desired ethylene differential pressure of 6.8 atmospheres. The reaction was run for the time indicated, after which time the reactor was quickly cooled and vented. The reactor contents were precipitated in methanol. The polymer was initially dried under a flow of air and then typically dried overnight in a vacuum oven at 90-100° C. The results of these polymerizations are summarized in Tables 13 and 14.

By way of example, small scale polymerizations (examples 110-389 and C20-C48) were conducted in an inert atmosphere (N2) drybox using autoclaves lined with glass test tubes (internal volume of reactor=23.5 mL) and equipped with disposable PEEK paddle stirrers (800 rpm). The autoclaves were prepared by purging with dry nitrogen at 110° C. for 5 hours and then at 25° C. for 5 hours. The diluent, comonomer, activator and co-activator (if used), were added via syringe at room temperature and atmospheric pressure. The reactor was then brought to process pressure and charged with ethylene while stirring at 800 RPM. The pre-catalyst (TMC) was added via syringe with the reactor at process conditions. In most cases the pre-catalyst was added as a solution. In some indicated examples, the pre-catalyst was added as a well dispersed slurry. Ethylene was allowed to enter (through the use of computer controlled solenoid valves) the autoclaves during polymerization to maintain reactor gauge pressure (±2 psig). Reactor temperature was monitored and typically maintained within ±1° C. Polymerizations were halted by addition of approximately 50 psid O_(2/)Ar (5 mole % O₂) gas mixture to the autoclaves for approximately 30 seconds. The polymerizations were quenched based on integrated ethylene pressure loss to produce approximately 0.10 to 0.15 grams or for a maximum of 15 minutes. The reactors were cooled and vented. The polymer was isolated after the solvent was removed in-vacuo. Yields reported include total weight of polymer and residual catalyst. Amounts of reagents used, process conditions and polymer characterization are reported in Tables 10-12.

For examples 397-403, 406-412, and C50-C51, polymerizations were conducted in a 300 cc Hasteloy C Parr reactor equipped with a paddle stirrer, a temperature controller, an on-demand supply of ethylene regulated to maintain a constant reactor pressure via a Pressure Vessel Tank (PVT, 500 cc volume charged with ˜1000 psig of ethylene), and a supply of dry high pressure nitrogen to maintain an inert atmosphere. Monomer was directly plumbed into the reactor. An approximate stirring speed of 450 rpm was used.

A typical ethylene polymerization reaction conducted using a 300 cc Hasteloy C Parr reactor (examples 397-403) began by adding 140 mL of dry toluene and 30 wt % MAO to the reactor bottom in the drybox (for example 399, B(C₆F₅)₃ (A1) was also added). Separately, in the drybox, the transition metal catalyst was dissolved in 10 mL dry toluene in a scintillation vial and loaded into a 30 cc stainless steel Hoke bomb. The Parr reactor was sealed, removed from the drybox, connected to an ethylene manifold with a 500 cc PVT charged with approximately 1000 psig of ethylene, heated to 80° C., stirred using a mechanical stirrer, pressurized with the desired gauge pressure of ethylene for three minutes, and then vented to atmospheric pressure. The Hoke bomb was attached to the injection port on the Parr reactor head and the 10 mL of transition metal catalyst solution was injected using a charge of ethylene equal to the desired gauge pressure. The ethylene pressure was maintained for the duration of the desired time using the PVT tank. Subsequently, the reactor was cooled to room temperature and vented, and the polymerization was quenched by injection of 5 mL MeOH. The contents of the reactor were added to an excess of acidified MeOH (5% v/v HCl) and stirred overnight. The insoluble polymer was collected by filtration, rinsed with additional clean MeOH, and dried in a vacuum oven overnight at 60° C. The results of these polymerizations are summarized in Tables 15 and 16.

By way of example, an ethylene polymerization reaction conducted in the presence of cyclohexene using a 300 cc Parr reactor (examples 406-412, C50-C51) began by adding 140 mL of dry toluene and 30 wt % MAO to the reactor bottom in the drybox. Separately, in the drybox, the transition metal catalyst was dissolved in 10 mL dry toluene in a scintillation vial and loaded into a 30 cc stainless steel Hoke bomb. The Parr reactor was sealed, removed from the drybox, connected to an ethylene manifold with a 500 cc PVT charged with approximately 1000 psig of ethylene, heated to 80° C., stirred using a mechanical stirrer, pressurized with the desired gauge pressure of ethylene for three minutes, and then vented to atmospheric pressure. The Hoke bomb was attached to the injection port on the Parr reactor head and the 10 mL of transition metal catalyst solution was injected using a charge of ethylene equal to the desired gauge pressure. The ethylene pressure was maintained for the duration of the desired time using the PVT tank. Subsequently, the reactor was cooled to room temperature and vented, and the polymerization was quenched by injection of 5 mL MeOH. The contents of the reactor were added to an excess of acidified MeOH (5% v/v HCl) and stirred overnight. The insoluble polymer was collected by filtration, rinsed with additional clean MeOH, and dried in a vacuum oven overnight at 60° C. The results of these polymerizations are summarized in Tables 17 and 18.

For examples 404-405, 413419, C49, and C52-C53, polymerizations were conducted in a 3 oz. glass Fischer-Porter pressure vessel equipped with an on-demand supply of ethylene regulated to maintain a constant reactor pressure via a PVT (500 cc volume charged with ˜1000 psig of ethylene), and a supply of dry high pressure nitrogen to maintain an inert atmosphere. Thermostatting was achieved by submersing the bottom of the vessel into an oil bath. Stirring was achieved using magnetic stirring bars.

A typical ethylene polymerization reaction conducted using a 3 oz. glass Fischer-Porter pressure vessel (examples 404-405, C49) began by charging the glass vessel in the drybox with a stirbar, 7 wt % MMAO, and 20 mL dry toluene (25 mL for example C49). The vessel was then sealed. Separately, in the drybox, the transition metal catalyst was dissolved or slurried in 5 mL dry toluene in a scintillation vial and loaded into a 5 mL air-tight syringe. The sealed pressure vessel was removed from the glove box, connected to an ethylene manifold with a 500 cc PVT charged with approximately 1000 psig of ethylene, heated to the desired temperature with magnetic stirring, and pressurized with the desired gauge pressure of ethylene. The vessel was vented to atmospheric pressure and the pressurization procedure repeated twice to ensure flushout of residual argon from the vessel. The transition metal catalyst solution was then injected into the vessel using the syringe port on the vessel head, and the vessel was then pressurized to the desired gauge pressure of ethylene and allowed to stir for the desired length of time. Subsequently, the vessel was vented and the polymerization was quenched with a small amount (1-5 mL) of 5 % by volume acidified methanol. The contents of the vessel were added to an excess of clean methanol and the precipitated polymer was collected by filtration, rinsed with additional methanol, and dried in a vacuum oven at 60° C. overnight. The results of these polymerizations are summarized in Tables 15 and 16.

By way of example, an ethylene polymerization conducted in the presence of cyclohexene using a 3 oz. glass Fischer-Porter pressure vessel (example 413) began by charging the glass vessel in the drybox with a stirbar, 30 wt % MAO, cyclohexene, and 20 mL dry toluene. The vessel was then sealed. Separately, in the drybox, the transition metal catalyst was dissolved in 5 mL dry toluene in a scintillation vial and loaded into a 5 mL air-tight syringe. The sealed pressure vessel was removed from the glove box, connected to an ethylene manifold with a 500 cc PVT charged with approximately 1000 psig of ethylene, heated to the desired temperature with magnetic stirring, and pressurized with the desired gauge pressure of ethylene. The vessel was vented to atmospheric pressure and the pressurization procedure repeated twice to ensure flush out of residual argon from the vessel. The transition metal catalyst solution was then injected into the vessel using the syringe port on the vessel head, and the vessel was then pressurized to the desired gauge pressure of ethylene and allowed to stir for the desired length of time. Subsequently, the vessel was vented and the polymerization was quenched with a small amount (1-5 mL) of 5 % by volume acidified methanol. The contents of the vessel were added to an excess of clean methanol and the precipitated polymer was collected by filtration, rinsed with additional methanol, and dried in a vacuum oven at 60° C. overnight. The results of this polymerization are summarized in Tables 17 and 18.

By way of example, an ethylene/cyclopentene copolymerization conducted using a 3 oz. glass Fischer-Porter pressure vessel (examples 414-419 and C52-C53) began by charging the glass vessel in the drybox with a stirbar, 30 wt % MAO or TMA/B(C₆F₅)₃ (A1), cyclopentene, and 20 mL dry toluene, TMA is trimethyl aluminum. The vessel was then sealed. Separately, in the drybox, the transition metal catalyst was dissolved or slurried in 5 mL dry toluene in a scintillation vial and loaded into a 5 mL air-tight syringe. The sealed pressure vessel was removed from the glove box, connected to an ethylene manifold with a 500 cc PVT charged with approximately 1000 psig of ethylene, heated to the desired temperature with magnetic stirring, and pressurized with the desired gauge pressure of ethylene. The vessel was vented to atmospheric pressure and the pressurization procedure repeated twice to ensure flush out of residual argon from the vessel. The transition metal catalyst solution was then injected into the vessel using the syringe port on the vessel head, and the vessel was then pressurized to the desired gauge pressure of ethylene and allowed to stir for the desired length of time. Subsequently, the vessel was vented and the polymerization was quenched with a small amount (1-5 mL) of 5 % by volume acidified methanol. The contents of the vessel were added to an excess of clean methanol and the precipitated polymer was collected by filtration, rinsed with additional methanol, and dried in a vacuum oven at 60° C. overnight. The results of these polymerizations are summarized in Tables 19 and 20.

For examples 420-426 and C54-C56, polymerizations were conducted in capped 20 mL glass scintillation vials in a drybox under an argon atmosphere. No temperature control was employed. Stirring was achieved using magnetic stirring bars.

A typical norbornene polymerization began by charging a 20 mL glass scintillation vial with the transition metal catalyst, a stirbar, and 2 mL (examples 420, 422, C54) or 2.5 mL (examples 421, 423-426, C55-C56) dry toluene in the drybox. In a separate vial, norbornene was weighed out. For examples 420, 422, and C54, 30 wt % MAO was then added directly to the neat norbornene, and this mixture was added to the transition metal catalyst solution after mixing. An additional 1 mL of toluene was used to rinse out the vial containing the 30 wt % MAO/norbornene and this rinse was then also added to the transition metal catalyst solution. For Examples 421, 423-424, and C55, the norbornene was diluted with 2.5 mL toluene and added to the transition metal catalyst solution, which was then further diluted with another 2 mL toluene. The 30 wt % MAO was then quickly weighed directly into the transition metal catalyst/norbornene solution. For Examples 425,426, and C66, B(C₆FS)₃ (A1) and trimethyl aluminum (TMA) were added to the norbornene along with 5 mL toluene. This mixture was then added to the transition metal catalyst solution. In each case, the vial containing the transition metal catalyst, activator, and norbomene was then capped and allowed to stir for the desired length of time at room temperature in the drybox, after which it was removed from the drybox and quenched with 50 mL of 50:1 v/v MeOH:HCl. After stirring the solids for 2-3 hours in excess clean methanol, the insoluble polymer was collected by filtration, rinsed with clean MeOH, and dried in a vacuum oven overnight at 60-75° C. The results of these polymerizations are summarized in Tables 21 and 22.

For examples 1-109, C2-14, and 390-396, molecular weights (weight average molecular weight (M_(w)) and number average molecular weight (M_(n))) were measured by Gel Permeation Chromatography using a Waters 150C Gel Permeation Chromatograph equipped with a differential refractive index detector and calibrated using polystyrene standards. BHT (2,6-di-tert-butyl-4-methylphenol) stabilized samples were run in 1,2,4-trichlorobenzene (145° C.) using three PLgel Mixed-B 10 μm (Polymer Laboratories) columns in series. No column spreading corrections were employed, but data on generally accepted standards, e.g. National Bureau of Standards Polyethylene 1475, demonstrated a precision with 0.1 units for M_(w)/M_(n), which was calculated from elution times. For examples 397-426 and C49-C56, molecular weights were measured on a Waters Associates 150 C High Temperature Gel Permeation Chromatograph equipped with a differential refractive index detector. BHT stabilized samples were run in 1,2,4-trichlorobenzene (135° C.) using three Polymer Laboratories mixed bed Type B columns at a 1.0 mL/min solvent flow rate. For examples 110-389 and C20-C48, molecular weights were measured by Gel Permeation Chromatography using a Symyx Technology GPC equipped with evaporative light scattering detector and calibrated using polystyrene standards (Polymer Laboratories: Polystyrene Calibration Kit S-M-10: Mp (peak Mw) between 5000 and 3,390,000). BHT stabilized samples were run in 1,2,4-trichlorobenzene at 135° C. sample temperature (160° C. oven/columns) using three Polymer Laboratories: PLgel 10 μm Mixed-B 300×7.5 mm columns in series. No column spreading corrections were employed. Numerical analyses were performed using Epoch® software available from Symyx Technologies.

For examples 1-109, C2-C14, and 390-396 polymer comonomer incorporation, branching and or end-group analysis was determined by ¹H NMR using a Varian Unity+400 MHz instrument run with a single 30° flip angle, RF pulse. 120 pulses with a delay of 8 seconds between pulses were signal averaged. The polymer sample was dissolved in heated tetrachloroethane-d² and signal collection took place at 120° C. For examples 37-42, 46-49, and 51-52, ¹³C NMR spectra were obtained using a 90 degree pulse angle, at least a 14 second delay between successive pulses, sweep width of 6900 Hz, with full broadband proton noise decoupling. Samples were dissolved at approximately 15% by weight in tetrachloroethane-d₂ and spectra were obtained at 125° C. For examples 397-419 and C53, polymer comonomer incorporation, end-group analysis, and/or branching was determined by ¹H or ¹³C NMR (as indicated), with Cr(acac)₃ used as a relaxation agent for ¹³C NMR spectra where noted (acac is acetylacetonate). The polymer sample was dissolved in heated 1,2-dichlorobenzene-d₄ or 1,1,2,2-tetrachloroethane-d₂ and signal collection took place at 120° C. A Varian Unity+500 MHz instrument with a 10 mm broadband or 5 mm switchable probe, or a Varian Inova 300 spectrometer with a 10 mm broadband probe, was used. Analysis of the ¹³C NMR spectra for Examples 37-42, 46-49, and 51-52 was as follows. Methyl branching (C₁) in the polymer was measured as the number of methyl branches per 1000 carbon atoms using the average branch intensity determined from the CH resonance at 33.2 ppm, the CH₃ resonance at 20.1 ppm, and the backbone CH₂ resonance that was next to the CH resonance at 37.6 ppm. Ethyl branching (C₂) in the polymer was measured as the number of ethyl branches per 1000 carbon atoms via using the average branch intensity determined from CH resonance at 39.4 ppm, the CH₂ resonance next to the CH resonance at 34.1 ppm, and when necessary the CH₃ resonance at 11.3 ppm. Propyl branching (C₃) in the polymer was measured as the number of propyl branches or chain ends per 1000 carbon atoms using the average branch intensity determined from the CH resonance at 37.9 ppm, the CH₃ resonance at 14.5 ppm, and the branch CH₂ signal at 20.4 ppm. Butyl and longer branching (C₄+) in the polymer was measured as the number of butyl and longer branches per 1000 carbon atoms using the branch CH resonance at 38.2 ppm. ¹³C NMR analysis for Examples 399,406-417. 419 and C50-C51 was as follows. Methyl branching (C₁) in the polymer was measured as the number of methyl branches per 1000 carbon atoms using the branch CH resonance at 33.2 ppm or the CH₃ resonance at 20.1 ppm. Ethyl branching (C₂) in the polymer was measured as the number of ethyl branches per 1000 carbon atoms using the branch CH resonance at 39.4 ppm or the CH₃ resonance at 11.3 ppm. Propyl branching (C₃) in the polymer was measured as the number of propyl branches or chain ends per 1000 carbon atoms using the branch CH₃ resonance at 14.5 ppm and optionally the CH₂ resonance at 20.4 ppm. Butyl and longer branching in the polymer was measured as the number of butyl and longer branches (C₄ ⁺) or chain ends per 1000 carbon atoms using the branch CH resonance at 38.2 ppm. “33.5 ppm CH units” was the number of CH units in the polymer per 1000 carbon atoms representing an additional, unidentified branch with a ¹³C NMR methine resonance at 33.5 ppm. End-group analysis for examples reporting these numbers were measured by ¹H NMR and were analyzed as follows. Vinylenes were measured as the number of vinylenes per 1000 carbon atoms using the resonances between 5.5-5.31 ppm. Trisubstituted end-groups (“trisubs”) were measured as the number of trisubstituted groups per 1000 carbon atoms using the resonances between 5.34.85 ppm, by difference from vinyls. Vinyl end-groups were measured as the number of vinyls per 1000 carbon atoms using the resonances between 5.9-5.65 and between 5.3-4.85 ppm. Vinylidene end-groups were measured as the number of vinylidenes per 1000 carbon atoms using the resonances between 4.85-4.65 ppm. Total olefins are the sum total of vinylene, trisubs, vinyl, and vinylidene structures measured as the number of olefins per 1000 carbon atoms via ¹H NMR. In some cases, vinylenes, trisubs, and vinyls are also tabulated as ratios of mole percentages of structures summing to 100%. Cyclopentene incorporated into the polymer was measured as a mole percentage of total olefinic monomer units incorporated via ¹³C NMR, using the 2-eme (41.22 ppm), 1,3-eme (40.67 ppm), α-cee (37.06 ppm), and optionally the 4,5-eme (32.22 ppm) peaks (Jerschow, A.; Ernst, E.; Hermann, W.; Müller, N. Macromolecules 1995, 28, 7095).

For examples 397-419 and C49-C52, DSC data were obtained on a TA Instruments 2920 calorimeter using a scan rate of 10 degrees per minute. Reported Tm (° C., melt transition) values are maxima of second heats.

For examples 110-389 and C20-C48, the sample preparation for SAMMS (Sensory Array Modular Measurement System) thermal analysis measurements involved depositing the BHT stabilized polymer solution onto a silanized wafer (Part Number S10457, Symyx). The solvent was then evaporated off at ˜145° C. By this method, approximately between 0.12 and 0.24 mg of polymer was deposited onto each corresponding wafer cell. Thermal analysis was measured on a Symyx Technologies SAMMS instrument that measures polymer melt temperatures via the 3 ω technique. The analysis first employs a rapid-scan protocol that heats each cell from 27° C. to 200° C. in ˜35 seconds and then rapidly cools the sample to room temperature. This complete procedure takes approximately 60 seconds per cell and was used to minimize each sample's thermal history. The second step involves running a high-resolution scan protocol to measure the second melt of the sample. The protocol heats each cell from 27° C. to 200° C. in ˜3 minutes and then rapidly cools the sample to room temperature. The high-resolution scan takes approximately three times the amount of time to complete as the rapid-scan protocol. If multiple melting peaks are present, Epoch® Software reports the largest amplitude peak. The results are reported in the tables as Tm (° C.).

The results of the polymerization experiments are tabulated below. In the following Tables, TMC refers to the identity of the transition metal compound (pre-catalyst=catalyst precursor) used. Al/M was the molar aluminum to transition metal ratio used. T was the reactor temperature in Celsius (° C.) and was controlled within a few degrees of the set temperature (unless indicated otherwise). C₂H₂ was the differential pressure of ethylene (unless indicated otherwise) in atmospheres that was semi-continuously fed to the reactor. Polymer (g or mg) was the weight of polymer produced. In some cases, residual ash was also present and contributes to this weight. Activity was the catalyst activity measured as kg of polymer per mole of transition metal compound per atmosphere of ethylene per hour (kg P/mol TMC·atm·hr) for reactions using ethylene, and as kg of polymer per mole of transition metal compound per hour (kg P mol TMC·hr) for reactions not using ethylene. Mw was weight average molecular weight of the polymer as measured by GPC. Mn was the number average molecular weight of the polymer as measured by GPC. MWD was Mw/Mn. Branching was the amount of short chain branching and long chain branching in the polymer as measured by ¹H NMR. It was reported as the number of branches per 1000 carbon atoms and was not corrected for chain end-groups. C₁, C₂, C₃, C₄ ⁺ was respectively, the methyl, ethyl, propyl and butyl and greater branching in the polymer measured as the number of respective branches per 1000 carbon atoms via ¹³C NMR. “33.5 ppm CH units” was the number of CH units in the polymer per 1000 carbon atoms representing an additional, unidentified branch with a ¹³C NMR methine resonance at 33.5 ppm. Vinylenes, trisubs, vinyls, and vinylidenes are respectively, the number of vinylene end-groups, trisubstituted end-groups, vinyl end-groups and vinylidene end-groups measured as the number of the respective end-groups per 1000 carbon atoms via ¹H NMR. In some cases, vinylenes, trisubs, vinyls and vinylidenes are also tabulated as ratios of mole percentages of structures summing to 100%. Mol % cyclopentene was the amount of cyclopentene incorporated into the polymer measured as a mole percentage of total olefinic monomer units incorporated via ¹³C NMR. Entries in the tables preceded by a “C#” are comparative examples. TABLE 1 Ethylene polymerization examples (Ni-1, Ni-2, Ni-3, Ni—Br) - Part A TMC¹ 10 wt % Al/M C₂H₄ Run # TMC (μmol) MAO (ml) (molar) T (° C.) (atm) Polymer (g) Activity 1 Ni-1 1.53 1.9 1246 80 4.42 0.8 468 2 Ni-1 1.98 2.5 1261 80 4.42 1.0 456 3 Ni-1 3.97 5 1261 80 4.42 1.9 433 4 Ni-1 3.97 5 1261 80 4.42 1.4 315 5 Ni-1 3.97 5 1261 60 3.54 9.5 2,697 6 Ni-1 3.97 5 1261 60 3.54 10.6 3,031 7 Ni-1 3.97 5 1261 40 2.72 7.4 2,747 8 Ni-1 1.98 2.5 1261 40 2.72 16.9 12,528 9 Ni-1 1.98 2.5 1261 40 2.72 18.2 13,507 10 Ni-1 1.98 2.5 1261 40 2.72 11.8 8,755 11 Ni-1 1.98 2.5 1261 40 2.72 18.2 13,507 12 Ni-1 1.98 2.5 1261 40 4.08 27.9 13,798 13 Ni-1 1.98 2.5 1261 40 4.08 27.2 13,442 14 Ni-1 1.07 1.3 1218 40 6.80 21.8 12,005 15 Ni-1 1.07 1.3 1218 40 6.80 23.1 12,704 16 Ni-2 4.00 5 1249 80 4.42 2.2 499 17 Ni-2 4.00 5 1249 80 4.42 2.2 499 18 Ni-2 4.00 5 1249 80 4.42 2.3 529 19 Ni-2 4.00 5 1249 60 3.54 8.3 2,350 20 Ni-2 4.00 5 1249 60 3.54 8.6 2,415 21 Ni-2 1.93 2.5 1294 40 2.72 20.3 15,465 22 Ni-2 1.93 2.5 1294 40 2.72 21.3 16,218 23 Ni-3 4.05 5 1234 80 4.42 1.9 429 24 Ni-3 4.05 5 1234 80 4.42 1.9 431 25 Ni-3 4.05 5 1234 60 3.54 9.2 2,573 26 Ni-3 4.05 5 1234 60 3.54 11.7 3,262 27 Ni-3 1.96 2.5 1278 40 2.72 20.5 15,404 28 Ni-3 1.96 2.5 1278 40 2.72 20.8 15,659 C1 Ni—Br 1.34 1.7 1265 80 4.42 1.2 834 C2 Ni—Br 2.69 3.4 1265 80 4.42 2.2 754 C3 Ni—Br 2.69 3.4 1265 80 4.42 1.2 397 C4 Ni—Br 2.69 3.4 1265 60 3.54 10.5 4,433 C5 Ni—Br 2.69 3.4 1265 60 3.54 7.6 3,180 C6 Ni—Br 1.34 1.7 1265 40 2.72 3.2 3,445 C7 Ni—Br 1.34 1.7 1265 40 2.72 5.1 5,555 ¹TMC was used as a toluene solution (10-15 mg of TMC per 10 ml of dried toluene) with the exception of NiBr that was added as a toluene slurry because of its poor solubility in toluene.

TABLE 2 Ethylene polymerization examples (Ni-1, Ni-2, Ni-3, Ni—Br) - Part B Run # Mw Mn MWD Branching Vinylenes Trisubs Vinyls Vinylidenes  1 44,476 20,515 2.17 48.7 — — — —  2 36,367 10,595 3.43 100.6 — — — —  3 24,661 10,043 2.46 51.2 0.68 0.01 0.63 0.05  4 26,565 10,547 2.52 52.6 0.55 0.00 0.55 0.11  5 78,175 26,136 2.99 30.4 0.14 0.01 0.33 0.06  6 82,051 27,549 2.98 31.5 0.41 0.00 0.62 0.08  7 87,552 26,881 3.26 — 0.15 0.00 0.27 0.01  8 128,383 40,744 3.15 11.9 0.06 0.04 0.36 0.03  9 126,189 42,484 2.97 12.3 0.04 0.00 0.29 0.00 10 155,842 38,849 4.01 8.8 0.07 0.09 0.24 0.00 11 126,405 37,202 3.40 9.9 0.04 0.01 0.22 0.00 12 125,497 39,657 3.16 7.0 0.07 0.03 0.22 0.01 13 121,909 40,917 2.98 7.5 0.03 0.01 0.23 0.01 14 110,715 39,809 2.78 4.2 0.04 0.03 0.26 0.01 15 121,356 42,104 2.88 4.3 0.03 0.04 0.25 0.02 16 29,739 11,433 2.60 59.8 0.44 0.00 0.46 0.08 17 38,998 16,310 2.39 58.6 0.51 0.01 0.50 0.05 18 176,641 14,947 11.82 52.0 0.36 0.00 0.40 0.07 19 94,798 27,012 3.51 46.9 0.42 0.00 0.64 0.04 20 82,891 24,447 3.39 37.6 0.21 0.00 0.31 0.04 21 122,154 44,401 2.75 16.7 0.06 0.02 0.28 0.01 22 125,810 37,279 3.37 29.7 0.08 0.02 0.29 0.01 23 40,150 17,592 2.28 44.9 0.44 0.01 0.42 0.05 24 62,180 15,706 3.96 43.5 0.45 0.00 0.41 0.03 25 75,871 24,424 3.11 32.5 0.22 0.04 0.37 0.03 26 89,053 25,915 3.44 28.7 0.18 0.00 0.30 0.04 27 117,747 40,699 2.89 13.7 0.06 0.00 0.30 0.01 28 115,762 37,892 3.06 13.0 0.05 0.01 0.29 0.01 C1 — — — — — — — — C2 27,282 13,763 1.98 52.9 0.49 0.00 0.45 0.00 C3 32,905 12,655 2.60 53.1 0.49 0.00 0.44 0.00 C4 53,660 21,914 2.45 31.8 0.21 0.00 0.34 0.00 C5 56,799 23,758 2.39 31.3 0.21 0.01 0.35 0.01 C6 122,362 38,891 3.15 10.5 0.04 0.00 0.26 0.00 C7 114,397 38,664 2.96 10.6 0.05 0.00 0.27 0.00

TABLE 3 Ethylene polymerization examples (Ni-6, Ni-8, Ni-9, Ni-10, Ni-11) - Part A TMC¹ 10 wt % Al/M C₂H₄ Run # TMC (μmol) MAO (ml) (molar) T (° C.) (atm) Polymer (g) Activity 29 Ni-6 2.02 2.5 1235 40 2.72 8.4 6,100 30 Ni-6 2.02 2.5 1235 40 2.72 8.1 5,867 31 Ni-6 2.02 2.5 1235 40 4.08 11.4 5,509 32 Ni-6 2.02 2.5 1235 40 4.08 9.3 4,502 33 Ni-6 2.02 2.5 1235 40 6.80 16.4 4,758 34 Ni-6 2.02 2.5 1235 40 6.80 16.1 4,662 35 Ni-8 1.97 2.5 1267 60 4.08 5.8 2,900 36 Ni-8 1.97 2.5 1267 60 4.08 6.9 3,412 37 Ni-8 1.97 2.5 1267 40 2.72 12.6 9,348 38 Ni-8 1.97 2.5 1267 40 2.72 12.4 9,214 39 Ni-8 1.97 2.5 1267 40 4.08 17.8 8,849 40 Ni-8 1.97 2.5 1267 40 4.08 18.0 8,919 41 Ni-8 1.97 2.5 1267 40 6.80 21.6 6,433 42 Ni-8 1.97 2.5 1267 40 6.80 26.1 7,780 43 Ni-9 2.00 2.5 1249 60 2.72 1.5 1,065 44 Ni-9 2.00 2.5 1249 60 4.08 2.8 1,381 45 Ni-9 2.00 2.5 1249 60 4.08 3.1 1,518 46 Ni-9 2.00 2.5 1249 40 2.72 7.1 5,185 47 Ni-9 2.00 2.5 1249 40 2.72 7.7 5,684 48 Ni-9 2.00 2.5 1249 40 4.08 14.2 6,962 49 Ni-9 2.00 2.5 1249 40 4.08 14.6 7,133 50 Ni-9 2.00 2.5 1249 40 6.80 22.0 6,474 51 Ni-9 2.00 2.5 1249 40 6.80 21.2 6,230 52 Ni-9 2.00 2.5 1249 40 6.80 19.1 5,611 53 Ni-10 1.59 2 1255 60 4.08 2.1 1,310 54 Ni-10 1.59 2 1255 60 4.08 2.1 1,267 55 Ni-10 1.59 2 1255 40 2.72 3.1 2,887 56 Ni-10 1.59 2 1255 40 2.72 3.1 2,887 57 Ni-10 1.59 2 1255 40 4.08 5.9 3,622 58 Ni-10 1.59 2 1255 40 4.08 5.4 3,345 59 Ni-10 1.59 2 1255 40 6.80 12.8 4,712 60 Ni-10 1.59 2 1255 40 6.80 12.1 4,476 61 Ni-11 1.69 2.1 1245 60 4.08 0.4 238 62 Ni-11 1.69 2.1 1245 40 2.72 0.5 462 63 Ni-11 4.07 5 1227 40 2.72 1.3 476 64 Ni-11 4.07 5 1227 40 6.80 4.1 595 65 Ni-11 4.07 5 1227 40 6.80 4.1 595 ¹TMC was used as a toluene solution (10-15 mg of TMC per 10 ml of dried toluene).

TABLE 4 Ethylene polymerization examples (Ni-6, Ni-8, Ni-9, Ni-10, Ni-11) - Part B Run # Mw Mn MWD Branching Vinylenes Trisubs Vinyls Vinylidenes 29 81,736 25,035 3.26 7.2 0.06 0.09 0.36 0.02 30 82,255 26,475 3.11 7.0 0.06 0.00 0.37 0.00 31 89,514 27,189 3.29 5.3 0.05 0.03 0.41 0.01 32 88,228 24,977 3.53 5.2 0.07 0.03 0.48 0.00 33 90,015 21,951 4.10 3.6 0.03 0.04 0.47 0.01 34 94,781 23,805 3.98 3.6 0.04 0.02 0.42 0.00 35 81,020 30,462 2.66 28.5 0.22 0.00 0.21 0.01 36 87,174 32,174 2.71 28.4 0.22 0.05 0.24 0.00  37* 163,368 63,581 2.57 10.1 0.09 0.04 0.17 0.03  38* 170,600 68,624 2.49 9.8 0.13 0.06 0.22 0.01  39* 182,533 68,863 2.65 7.3 0.05 0.04 0.22 0.00  40* 177,117 69,642 2.54 6.7 0.07 0.01 0.21 0.00  41* 186,631 73,028 2.56 4.8 0.03 0.03 0.17 0.00  42* 198,810 72,713 2.73 5.4 0.05 0.07 0.22 0.01 43 — — — — — — — — 44 68,223 35,367 1.93 45.1 0.20 0.02 0.12 0.00 45 74,446 38,081 1.95 43.3 0.23 0.08 0.14 0.01  46* 159,262 78,111 2.04 25.2 0.06 0.05 0.10 0.01  47* 164,038 83,573 1.96 24.8 0.08 0.05 0.07 0.00  48* 195,159 99,784 1.96 16.5 0.04 0.03 0.07 0.01  49* 205,312 104,344 1.97 16.2 0.04 0.01 0.06 0.00 50 — — — — — — — —  51* 228,227 121,791 1.87 9.6 0.02 0.04 0.10 0.01  52* 239,395 121,472 1.97 11.2 0.05 0.00 0.10 0.04 53 147,019 52,551 2.80 63.3 0.02 0.00 0.00 0.00 54 133,783 53,363 2.51 65.0 0.19 0.02 0.10 0.01 55 228,529 89,684 2.55 45.3 0.07 0.02 0.06 0.00 56 234,777 98,409 2.39 45.6 0.07 0.00 0.00 0.00 57 270,638 128,710 2.10 29.2 0.06 0.01 0.07 0.02 58 262,150 124,119 2.11 34.8 0.07 0.01 0.08 0.02 59 452,163 179,086 2.52 19.2 — — — — 60 409,991 151,694 2.70 22.1 — — — — 61 — — — — — — — — 62 — — — — — — — — 63 398,463 107,545 3.71 48.9 — — — — 64 716,861 306,698 2.34 45.3 — — — — 65 600,331 256,418 2.34 36.8 — — — — *Branching by ¹³C NMR was also measured for examples 37-42, 46-49, and 51-52; the numbers are reported as branches per 1000 C. 37: 8.1 C₁, 0.7 C₂, 0.3 C₃, 0.5 C₄ ⁺; 38: 8.0 C₁, 0.6 C₂, 0.3 C₃, 0.6 C₄ ⁺; 39: 6.1 C₁, 0.5 C₂, 0.3 C₃, 0.3 C₄ ⁺; 40: 6.0 C₁, 0.4 # C₂, 0.2 C₃, 0.2 C₄ ⁺; 41: 4.3 C₁, 0.3 C₂, 0.2 C₃, 0.1 C₄ ⁺; 42: 4.5 C₁, 0.3 C₂, 0.1 C₃, 0.2 C₄ ⁺; 46: 17.5 C₁, 1.4 C₂, 1.4 C₃, 3.6 C₄ ⁺; 47: 17.4 C₁, 1.3 C₂, 1.2 C₃, 3.3 C₄ ⁺; 48: 12.6 # C₁, 0.8 C₂, 0.9 C₃, 1.4 C₄ ⁺; 49: 12.7 C₁, 0.9 C₂, 0.5 C₃, 2.0 C₄ ⁺; 51: 8.9 C₁, 0.6 C₂, 0.5 C₃, 0.7 C₄ ⁺; 52: 7.8 C₁, 0.6 C₂, 0.2 C₃, 0.7 C₄ ⁺;

TABLE 5 Ethylene polymerization examples (Co-1, Co—Cl) - Part A TMC¹ 10 wt % Al/M Additive T C₂H₄ Polymer Run # TMC (μmol) MAO (ml) (molar) Additive² (μmol) (° C.) (atm) (g) Activity 66 Co-1 2.96 1.7 575 none 0 80 4.42 1.4 441 67 Co-1 2.96 1.7 575 none 0 80 4.42 0.9 263 68 Co-1 2.96 1.7 575 none 0 80 4.42 1.8 563 69 Co-1 2.96 1.7 575 none 0 80 4.42 2.6 781 70 Co-1 2.96 1.7 575 none 0 60 4.08 4.3 1,436 71 Co-1 2.96 1.7 575 none 0 60 4.08 3.5 1,151 72 Co-1 2.96 1.7 575 none 0 40 2.72 4.9 2,413 73 Co-1 2.96 1.7 575 none 0 40 2.72 3.5 1,721 74 Co-1 2.96 1.7 575 none 0 40 2.72 7.3 3,616 75 Co-1 2.96 1.7 575 none 0 40 2.72 7.0 3,472 C8  Co—Cl 5.84 3.4 582 none 0 80 4.42 11.7 1,814 C9  Co—Cl 2.92 1.7 582 none 0 80 4.42 5.1 1,565 C10 Co—Cl 2.92 1.7 582 none 0 80 4.42 3.8 1,187 C11 Co—Cl 2.92 1.7 582 none 0 60 3.54 9.3 3,598 C12 Co—Cl 2.92 1.7 582 none 0 60 3.54 11.0 4,256 C13 Co—Cl 2.92 1.7 582 none 0 40 2.72 19.3 9,721 C14 Co—Cl 2.92 1.7 582 none 0 40 2.72 18.2 9,167 76 Co-1 2.96 1.7 575 A 3.0 40 2.72 8.7 4,303 77 Co-1 2.96 1.7 575 A 3.0 40 2.72 9.4 4,651 78 Co-1 2.96 1.7 575 A 6.1 40 2.72 11.1 5,507 79 Co-1 2.96 1.7 575 A 6.1 40 2.72 10.1 5,004 80 Co-1 2.96 1.7 575 A 15.1 40 2.72 7.8 3,865 81 Co-1 2.96 1.7 575 A 15.1 40 2.72 7.4 3,671 82 Co-1 2.96 1.7 575 B 6.0 40 2.72 6.7 3,318 83 Co-1 2.96 1.7 575 B 6.0 40 2.72 7.5 3,726 84 Co-1 2.96 1.7 575 C 6.0 40 2.72 3.5 1,761 85 Co-1 2.96 1.7 575 C 6.0 40 2.72 3.9 1,915  86³ Co-1 2.96 1.7 575 none 0 40 2.72 4.1 2,049  87³ Co-1 2.96 1.7 575 none 0 40 2.72 1.8 895  88⁴ Co-1 2.96 1.7 575 A 6.1 40 2.72 6.6 3,263  89⁴ Co-1 2.96 1.7 575 A 6.1 40 2.72 6.4 3,184 ¹TMC was used as a toluene solution (10-15 mg of TMC per 10 ml of dried toluene). ²Additive: A = 2,5-di-tert-butyl-1,4-benzoquinone; B: 3,3′,5,5′-tetra-tert-butyldiphenylquinone; C: 1,4-benzoquinone. For all experiments, the additive was premixed with the TMC prior to addition to the reactor. Upon addition of the quinone to the TMC, a color change form purple to a shade of green occurs. ³The TMC was preactivated with 0.5 ml of MAO (10 wt % in toluene) prior to being added to the reactor which contained the balance of the MAO (1.2 ml). ⁴The TMC was mixed with the quinone prior to the preactivation with 0.5 ml of MAO (10 wt % in toluene); it was then added to the reactor which contained the balance of the MAO (1.2 ml).

TABLE 6 Ethylene polymerization examples (Co-1, Co—Cl) - Part B Run # Mw Mn MWD Branching Vinylenes Trisubs Vinyls Vinylidenes 66 — — — — — — — — 67 1,644 844 1.95 12.5 0.00 0.00 11.40 0.09 68 1,499 862 1.74 11.5 0.00 0.07 11.25 0.09 69 1,299 771 1.68 13.2 0.00 0.00 11.94 0.13 70 1,876 979 1.92 10.8 0.02 0.27 10.21 0.05 71 1,644 999 1.65 10.9 0.02 0.27 10.45 0.05 72 2,308 1,102 2.09 9.6 0.01 0.19 9.33 0.04 73 2,115 1,124 1.88 9.4 0.00 0.09 9.03 0.05 74 2,277 861 2.64 12.4 0.00 0.03 10.71 0.05 75 2,171 940 2.31 12.3 0.00 0.00 10.36 0.04 C8  1,696 1,068 1.59 19.8 0.09 0.72 17.45 0.05 C9  1,718 1,072 1.60 16.1 0.05 0.57 14.85 0.06 C10 2,093 1,356 1.54 13.4 0.05 0.64 12.99 0.05 C11 1,543 1,312 1.18 12.7 0.04 0.40 11.75 0.04 C12 2,168 1,373 1.58 13.4 0.04 0.46 12.47 0.04 C13 2,527 1,455 1.74 11.5 0.05 0.37 10.68 0.04 C14 2,648 1,501 1.76 11.3 0.15 0.82 11.16 0.01 76 2,282 974 2.34 11.2 0.05 0.24 9.84 0.03 77 2,074 871 2.38 10.8 0.00 0.00 9.03 0.03 78 1,923 803 2.39 14.7 0.03 0.15 10.87 0.04 79 1,977 780 2.53 14.3 0.03 0.40 9.88 0.05 80 2,319 998 2.32 11.6 0.02 0.05 8.72 0.03 81 2,246 932 2.41 15.1 0.01 0.09 10.22 0.03 82 2,303 965 2.39 12.4 0.00 0.00 9.95 0.05 83 2,393 1,068 2.24 10.5 0.01 0.10 9.86 0.06 84 5,118 858 5.97 11.5 0.07 0.22 8.42 0.03 85 3,889 1,025 3.79 12.6 0.00 0.00 7.87 0.04 86 339,521 7,273 46.68 9.5 0.00 0.00 1.72 0.41 87 68,632 1,023 67.09 9.4 0.00 0.00 8.64 0.09 88 2,445 947 2.58 12.5 0.00 0.00 9.63 0.05 89 2,757 837 3.29 12.7 0.00 0.00 9.58 0.05

TABLE 7 Propylene polymerization examples (Ni-1, Ni-6, Ni-8, Ni-9, Ni-10, Ni-11, Ni—Br) 10 wt % TMC¹ MAO Al/M T Polymer Run # TMC (μmol) (ml) (molar) (° C.) (g) Activity Mw Mn MWD 90 Ni-1 3.97 5 1261 40 2.4 1,230 118,966 68,576 1.73 91 Ni-1 3.97 5 1261 40 2.8 1,432 122,181 77,091 1.58 92 Ni-1 5.80 3 518 40 2.8 952 — — — 93 Ni-1 9.46 5 529 40 4.3 918 — — — 94 Ni-6 9.57 5 522 40 1.7 359 — — — 95 Ni-6 9.57 5 522 40 1.7 349 — — — 96 Ni-6 9.57 5 522 40 1.6 343 — — — C15 Ni—Br 3.36 1.8 536 40 1.3 774 — — — C16 Ni—Br 6.72 3.6 536 40 2.3 684 — — — C17 Ni—Br 6.72 3.6 536 40 3.1 908 — — — C18 Ni—Br 9.58 5 522 40 4.0 825 119,904 72,726 1.65 C19 Ni—Br 9.58 5 522 40 6.0 1,261 114,823 65,255 1.76 97 Ni-8 9.51 5 526 40 2.0 425 — — — 98 Ni-9 9.51 5 526 40 1.2 242 — — — 99 Ni-10 9.56 5 523 40 1.2 247 — — — 100  Ni-11 9.55 5 523 40 0.7 142 — — — ¹TMC was used as a toluene solution (10-15 mg of TMC per 10 ml of toluene) with the exception of NiBr that was added as a toluene slurry because of its poor solubility in toluene.

TABLE 8 Ethylene/Propylene (EP) or Ethylene/1-Hexene (EH) copolymerization examples (Co-1) - Part A Run TMC 10 wt % Run # Type TMC¹ (μmol) MAO (ml) Al/M T (° C.) C₂H₄ (atm) Polymer (g) Activity 101 EP Co-1 5.910 3.4 575 80 4.76 0.8 107 102 EP Co-1 5.910 3.4 575 80 4.76 1.0 138 103 EP Co-1 5.910 3.4 575 40 3.27 1.4 286 104 EP Co-1 5.910 3.4 575 40 3.27 1.1 222 105 EH Co-1 2.955 1.7 575 80 4.42 0.6 184 106 EH Co-1 2.955 1.7 575 80 4.42 0.5 141 107 EH Co-1 5.910 3.4 575 80 4.42 2.1 328 108 EH Co-1 5.910 3.4 575 40 2.38 3.7 1,063 109 EH Co-1 5.910 3.4 575 40 2.38 2.9 816 ¹TMC was used as a toluene solution (10-15 mg of TMC per 10 ml of dried toluene).

TABLE 9 Ethylene/Propylene (EP) or Ethylene/1-Hexene (EH) copolymerization examples (Co-1) - Part B Run # Mw Mn MWD Branching Vinylenes Trisubs Vinyls Vinylidenes 101 — — — — — — — — 102 2,060 1,174 1.75 20.7 1.18 0.85 13.50 0.12 103 — — — — — — — — 104 — — — — — — — — 105 1,062   555 1.91 17.2 0.37 0.26 15.23 0.08 106 1,253   767 1.63 13.9 0.31 0.20 12.89 0.08 107 1,475   841 1.75 12.4 0.23 0.07 11.29 0.10 108 1,910 1,091 1.75 10.5 0.14 0.10  9.69 0.05 109 1,873 1,049 1.79 10.8 0.15 0.14  9.74 0.05

TABLE 10 Ethylene polymerization examples (Ni-1, Ni-2, Ni-3, Ni-6, Ni-8, Ni-9, Ni-10, Ni-11, Ni—Br, Co-1, Co-2, Co—Cl). C₂H₄ guage Rxn T pressure time Polymer Tm Run # TMC (° C.) (atm) (sec) (mg) Activity Mw Mn MWD (° C.) 110 Ni-1 40 7.07 42 176.9 10,729 77,067 48,382 1.59 121.3 111 Ni-1 60 7.21 34 146.3 10,811 56,936 35,838 1.59 103.6 112 Ni-1 80 7.35 37 100.6 6,663 38,047 24,924 1.53 104.6 113 Ni-1 40 7.07 71 193.8 6,954 100,709 62,948 1.60 121.8 114 Ni-1 60 7.21 38 136.2 9,037 62,187 40,630 1.53 113.1 115 Ni-1 80 7.35 37 102.3 6,734 41,503 26,842 1.55 138.7 116 Ni-2 40 7.07 38 178.7 11,862 78,911 47,925 1.65 117.1 117 Ni-2 60 7.21 33 150.2 11,256 54,307 34,654 1.57 125.1 118 Ni-2 80 7.35 39 97.3 6,192 37,208 23,798 1.56 123.4 119 Ni-2 40 7.07 66 191.4 7,429 84,175 49,409 1.70 122.0 120 Ni-2 60 7.21 35 151.1 10,930 54,667 34,373 1.59 110.4 121 Ni-2 80 7.35 48 99.7 5,138 39,278 25,187 1.56 136.1 122 Ni-3 40 7.07 57 190.9 8,470 82,064 48,280 1.70 122.2 123 Ni-3 60 7.21 32 148.4 11,583 53,965 33,630 1.60 107.2 124 Ni-3 80 7.35 39 83.2 5,248 38,740 24,203 1.60 137.6 125 Ni-3 40 7.07 48 191.2 10,203 82,836 48,995 1.69 121.8 126 Ni-3 60 7.21 32 149.0 11,487 53,510 32,708 1.64 112.2 127 Ni-3 80 7.35 46 98.4 5,248 38,594 24,875 1.55 108.5 128 Ni-8 40 7.07 44 173.2 9,986 89,456 55,489 1.61 122.6 129 Ni-8 60 7.21 39 124.6 7,930 63,196 41,812 1.51 110.6 130 Ni-8 80 7.35 57 79.7 3,407 43,678 27,598 1.58 112.1 131 Ni-8 40 7.07 46 174.2 9,711 98,869 60,135 1.64 122.5 132 Ni-8 60 7.21 42 126.8 7,508 57,570 37,886 1.52 122.3 133 Ni-8 80 7.35 53 89.9 4,193 42,198 27,887 1.51 133.3 134 Ni-9 40 7.07 77 163.9 5,421 172,060 107,940 1.59 104.5 135 Ni-9 60 7.21 63 119.8 4,781 105,868 72,106 1.47 85.8 136 Ni-9 80 7.35 80 80.7 2,476 63,348 43,698 1.45 106.0 137 Ni-9 40 7.07 73 167.5 5,806 177,050 111,809 1.58 106.1 138 Ni-9 60 7.21 61 119.9 4,904 103,663 70,959 1.46 107.5 139 Ni-9 80 7.35 75 84.0 2,732 67,769 46,888 1.45 115.9 140 Ni-10 40 7.07 118 162.3 3,487 263,107 160,249 1.64 90.4 141 Ni-10 60 7.21 90 108.2 2,985 168,080 104,528 1.61 120.5 142 Ni-10 80 7.35 95 81.3 2,090 107,404 67,343 1.59 124.6 143 Ni-10 40 7.07 106 168.2 4,042 270,980 165,541 1.64 93.1 144 Ni-10 60 7.21 87 101.2 2,901 161,539 101,155 1.60 100.4 145 Ni-10 80 7.35 99 86.1 2,129 113,885 73,169 1.56 171.5 146 Ni-6 40 7.07 38 164.6 11,000 48,864 29,957 1.63 129.2 147 Ni-6 60 7.21 35 120.9 8,657 36,260 22,169 1.64 121.4 148 Ni-6 80 7.35 68 66.4 2,378 26,507 15,556 1.70 135.7 149 Ni-6 40 7.07 75 175.2 5,910 58,857 32,777 1.80 128.3 150 Ni-6 60 7.21 33 119.7 9,143 36,086 22,409 1.61 119.8 151 Ni-6 80 7.35 56 81.8 3,598 25,417 15,704 1.62 135.3 C20 Ni—Br 40 7.07 472 158.0 852 168,529 102,309 1.65 118.4 C21 Ni—Br 60 7.21 64 117.2 4,552 78,541 51,465 1.53 107.8 C22 Ni—Br 80 7.35 111 63.1 1,397 54,377 36,370 1.50 112.9 C23 Ni—Br 40 7.07 450 161.6 913 172,099 104,225 1.65 116.5 C24 Ni—Br 60 7.21 78 109.3 3,489 81,635 54,796 1.49 113.6 C25 Ni—Br 80 7.35 108 69.3 1,572 59,366 40,351 1.47 113.4 152 Ni-1 40 7.07 55 209.1 9,692 72,317 38,502 1.88 129.5 153 Ni-1 40 4.35 67 175.0 10,804 97,858 60,047 1.63 115.7 154 Ni-1 40 2.99 77 106.6 8,278 89,328 57,917 1.54 109.5 155 Ni-1 40 7.07 124 213.2 4,386 101,881 61,024 1.67 120.9 156 Ni-1 40 4.35 74 157.1 8,769 100,260 62,200 1.61 115.3 157 Ni-1 40 2.99 77 129.3 10,103 99,737 63,357 1.57 111.0 158 Ni-2 40 7.07 42 194.5 11,710 83,290 50,016 1.67 120.8 159 Ni-2 40 4.35 48 147.7 12,598 86,218 53,339 1.62 116.1 160 Ni-2 40 2.99 65 108.7 10,010 77,652 49,475 1.57 109.9 161 Ni-2 40 7.07 79 215.3 6,899 94,313 56,149 1.68 121.2 162 Ni-2 40 4.35 53 138.8 10,827 84,573 51,221 1.65 115.9 163 Ni-2 40 2.99 67 119.8 10,825 82,149 52,349 1.57 112.2 164 Ni-3 40 7.07 79 201.8 6,474 89,492 53,829 1.66 121.4 165 Ni-3 40 4.35 52 142.4 11,352 84,019 51,709 1.62 115.7 166 Ni-3 40 2.99 69 110.3 9,581 78,711 49,367 1.59 112.2 167 Ni-3 40 7.07 43 191.9 11,450 86,291 51,413 1.68 120.7 168 Ni-3 40 4.35 50 139.4 11,627 82,953 50,043 1.66 116.6 169 Ni-3 40 2.99 73 117.4 9,619 81,032 50,849 1.59 111.2 170 Ni-8 40 7.07 91 197.7 5,513 108,924 64,101 1.70 121.9 171 Ni-8 40 4.35 59 136.2 9,585 95,295 58,705 1.62 117.1 172 Ni-8 40 2.99 72 105.9 8,812 88,202 54,778 1.61 113.1 173 Ni-8 40 7.07 51 183.1 9,152 101,725 61,169 1.66 121.7 174 Ni-8 40 4.35 63 131.4 8,641 92,283 56,367 1.64 118.6 175 Ni-8 40 2.99 74 106.9 8,669 89,588 55,490 1.61 114.3 176 Ni-9 40 7.07 81 186.1 5,876 179,103 113,522 1.58 100.1 177 Ni-9 40 4.35 89 121.1 5,600 182,221 118,953 1.53 91.6 178 Ni-9 40 2.99 124 88.2 4,263 159,771 109,184 1.46 86.2 179 Ni-9 40 7.07 81 214.0 6,688 190,939 116,634 1.64 102.7 180 Ni-9 40 4.35 85 118.3 5,766 171,377 113,636 1.51 93.3 181 Ni-9 40 2.99 120 96.0 4,813 170,123 116,765 1.46 74.4 182 Ni-10 40 7.07 123 183.3 3,784 270,211 164,727 1.64 88.5 183 Ni-10 40 4.35 139 104.8 3,123 252,326 160,659 1.57 92.9 184 Ni-10 40 2.99 178 83.1 2,815 227,347 145,921 1.56 69.0 185 Ni-10 40 7.07 103 168.4 4,152 270,271 166,297 1.63 88.5 186 Ni-10 40 4.35 133 99.6 3,102 247,965 157,896 1.57 80.9 187 Ni-10 40 2.99 165 83.0 3,031 234,378 152,875 1.53 78.1 188 Ni-6 40 7.07 109 194.0 4,513 64,597 34,939 1.85 135.0 189 Ni-6 40 4.35 112 136.0 5,025 61,331 33,762 1.82 113.8 190 Ni-6 40 2.99 201 112.5 3,358 61,035 32,376 1.89 124.7 191 Ni-6 40 7.07 147 202.6 3,502 68,978 36,113 1.91 112.9 192 Ni-6 40 4.35 73 129.0 7,332 52,612 30,332 1.73 128.6 193 Ni-6 40 2.99 122 115.1 5,651 59,014 32,399 1.82 125.7 C26 Ni—Br 40 7.07 342 161.3 1,198 165,753 102,421 1.62 121.0 C27 Ni—Br 40 4.35 244 113.9 1,929 168,900 108,771 1.55 117.7 C28 Ni—Br 40 2.99 163 84.1 3,104 152,583 97,274 1.57 110.0 C29 Ni—Br 40 7.07 241 156.4 1,654 169,317 112,718 1.50 117.0 C30 Ni—Br 40 4.35 174 101.9 2,421 166,677 108,907 1.53 115.8 C31 Ni—Br 40 2.99 171 87.0 3,056 159,536 102,535 1.56 108.5 194 Ni-1 40 7.07 46 183.9 10,252 78,058 47,868 1.63 121.0 195 Ni-1 60 7.21 34 148.1 10,873 55,361 35,052 1.58 102.1 196 Ni-1 80 7.35 37 99.5 6,532 37,978 25,013 1.52 114.4 197 Ni-1 40 7.07 51 170.1 8,553 84,468 52,113 1.62 122.7 198 Ni-1 60 7.21 33 142.4 10,844 56,766 36,762 1.54 102.2 199 Ni-1 80 7.35 34 101.9 7,347 40,006 26,575 1.51 119.8 200 Ni-1* 40 7.07 44 175.4 10,033 85,163 51,749 1.65 120.1 201 Ni-1* 60 7.21 35 145.5 10,371 55,132 35,536 1.55 102.8 202 Ni-1* 80 7.35 38 97.9 6,274 38,466 24,381 1.58 130.7 203 Ni-1* 40 7.07 51 185.4 9,231 83,126 50,397 1.65 120.9 204 Ni-1* 60 7.21 37 137.4 9,394 56,035 36,062 1.55 100.6 205 Ni-1* 80 7.35 37 99.5 6,550 38,787 24,821 1.56 111.3 206 Co-1 40 7.07 127 190.0 3,817 3,981 2,842 1.40 122.4 207 Co-1 60 7.21 66 114.2 4,306 3,199 2,446 1.31 157.5 208 Co-1 80 7.35 69 96.7 3,444 2,772 2,212 1.25 113.8 209 Co-1 40 7.07 132 191.7 3,699 3,808 2,774 1.37 112.4 210 Co-1 60 7.21 65 106.5 4,092 3,241 2,540 1.28 103.3 211 Co-1 80 7.35 69 97.7 3,467 2,626 2,117 1.24 105.3 C32 Co—Cl 40 7.07 40 156.8 10,008 2,988 2,394 1.25 111.4 C33 Co—Cl 60 7.21 27 136.9 12,780 2,758 2,258 1.22 144.3 C34 Co—Cl 80 7.35 30 117.4 9,629 2,456 2,076 1.18 134.8 C35 Co—Cl 40 7.07 38 156.8 10,571 3,070 2,442 1.26 126.1 C36 Co—Cl 60 7.21 29 133.0 11,612 2,730 2,246 1.22 123.7 C37 Co—Cl 80 7.35 30 118.2 9,592 2,340 1,979 1.18 130.0 212 Co-2 40 7.07 901 10.6 30 — — — — 213 Co-2 60 7.21 652 11.4 44 — — — — 214 Co-2 80 7.35 901 7.9 21 — — — — 215 Co-2 40 7.07 900 13.2 37 — — — — 216 Co-2 60 7.21 415 11.8 71 — — — — 217 Co-2 80 7.35 901 8.4 23 — — — — 218 Ni-11 40 7.07 362 103.5 727 612,779 371,393 1.65 78.0 219 Ni-11 60 7.21 568 54.0 237 571,547 252,259 2.27 132.3 220 Ni-11 80 7.35 900 35.5 97 452,269 147,900 3.06 97.4 221 Ni-11 40 7.07 311 114.4 935 623,344 377,286 1.65 75.7 222 Ni-11 80 7.35 901 30.9 84 391,893 134,195 2.92 99.7 C38 Ni—Br 40 7.07 334 134.9 1,028 163,988 108,366 1.51 118.9 C39 Ni—Br 60 7.21 72 114.6 3,962 78,822 55,385 1.42 101.0 C40 Ni—Br 80 7.35 86 74.0 2,111 51,076 34,247 1.49 77.8 C41 Ni—Br 40 7.07 292 150.2 1,309 162,370 107,124 1.52 121.3 C42 Ni—Br 60 7.21 85 101.1 2,955 83,511 57,398 1.45 103.7 C43 Ni—Br 80 7.35 85 73.7 2,115 53,788 37,009 1.45 125.1 223 Ni-1 40 7.07 49 189.9 9,772 82,825 52,635 1.57 117.2 224 Ni-1 40 4.35 46 153.1 13,778 79,559 51,814 1.54 110.8 225 Ni-1 40 2.99 66 106.4 9,655 73,307 48,486 1.51 105.2 226 Ni-1 40 7.07 61 195.4 8,157 84,378 51,810 1.63 116.5 227 Ni-1 40 4.35 58 139.9 10,021 87,313 57,320 1.52 112.5 228 Ni-1 40 2.99 71 122.9 10,471 78,058 51,257 1.52 107.2 229 Ni-1* 40 7.07 43 185.3 10,979 79,770 50,262 1.59 117.2 230 Ni-1* 40 4.35 48 138.5 11,880 78,803 50,304 1.57 110.8 231 Ni-1* 40 2.99 67 109.3 9,742 75,232 49,695 1.51 105.1 232 Ni-1* 40 7.07 54 183.5 8,673 95,522 60,932 1.57 115.4 233 Ni-1* 40 4.35 65 142.0 9,021 90,277 58,638 1.54 111.8 234 Ni-1* 40 2.99 68 116.6 10,277 78,624 52,944 1.49 107.2 235 Co-1 40 7.07 117 152.3 3,306 5,413 3,058 1.77 128.3 236 Co-1 40 4.35 144 150.3 4,319 4,153 2,988 1.39 99.8 237 Co-1 40 2.99 174 105.7 3,654 4,380 3,090 1.42 103.2 238 Co-1 40 7.07 101 191.8 4,827 3,813 2,822 1.35 111.7 239 Co-1 40 4.35 120 120.3 4,151 4,104 3,031 1.35 126.4 240 Co-1 40 2.99 176 108.5 3,703 4,183 2,994 1.40 125.2 C44 Co—Cl 40 7.07 31 150.1 12,166 3,384 2,672 1.27 105.8 C45 Co—Cl 40 4.35 32 105.9 13,631 3,480 2,690 1.29 117.0 C46 Co—Cl 40 2.99 62 102.3 9,948 3,636 2,797 1.30 104.5 C47 Co—Cl 40 7.07 15 116.6 19,276 3,384 2,649 1.28 108.5 C48 Co—Cl 40 4.35 42 111.8 10,961 3,637 2,816 1.29 116.0 241 Co-2 40 2.99 901 6.6 44 — — — — 242 Co-2 40 7.07 464 6.4 35 — — — — 243 Co-2 40 4.35 902 6.2 28 — — — — 244 Co-2 40 2.99 901 6.5 43 — — — — 245 Ni-11 40 7.07 284 113.9 1,020 665,141 423,947 1.57 80.0 246 Ni-11 40 4.35 287 64.4 927 523,696 331,938 1.58 70.1 247 Ni-11 40 2.99 510 49.6 585 495,788 306,402 1.62 62.3 248 Ni-11 40 7.07 280 115.7 1,052 593,274 387,252 1.53 79.8 249 Ni-11 40 4.35 223 67.1 1,244 510,000 332,886 1.53 67.0 250 Ni-11 40 2.99 360 41.1 686 454,760 285,715 1.59 58.7 251 Ni—Br 40 2.99 150 78.1 3,132 145,653 95,837 1.52 107.7 252 Ni—Br 40 7.07 229 154.9 1,721 159,791 105,261 1.52 115.6 253 Ni—Br 40 4.35 146 96.2 2,728 157,079 104,711 1.50 110.1 254 Ni—Br 40 2.99 157 84.8 3,245 142,170 93,103 1.53 105.6 Standard Reaction Conditions: TMC (0.20 μmol) delivered as a 100 μL of a 0.002 M solution in toluene except for Ni—Br and Co—Cl; Ni—Br and Co—Cl were prepared at the same concentrations indicated, however, these materials were not completely soluble in toluene. Because of this, the vials were shaken well before removing 100 μL of the # suspended transition metal compound. 10 wt % MAO in toluene (100 μmol) delivered as 132.4 μL of a 0.755 M solution in toluene; Al/M molar ratio = 500; Toluene was used as the reactor solvent and delivered to the reactor for a total volume of 5 mL. Ni-1* was an aged Ni-1 solution that was stored overnight in a freezer.

TABLE 11 Ethylene polymerization examples using mixed activators (Ni-1, Ni-2, Ni-3, Ni-6, Co-1 with MAO or MAO/A1 or MAO/A2 or TMA/A2). Rxn Run Activator Activator 1 time Polymer Tm # TMC 1* Activator 2 (μmol) (sec) (mg) Activity Mw Mn MWD (° C.) 255 Ni-1 MAO — 20.00 40 156.0 10,015 83,884 52,790 1.59 114.9 256 Ni-2 MAO — 20.00 34 158.0 11,893 71,708 43,775 1.64 110.7 257 Ni-3 MAO — 20.00 40 145.3 9,141 81,788 48,055 1.70 181.0 258 Co-1 MAO — 20.00 106 90.3 2,167 4,078 2,991 1.36 115.9 259 Ni-6 MAO — 20.00 60 161.8 6,914 52,435 26,602 1.97 122.9 260 Ni-1 MAO — 20.00 33 147.8 11,255 78,056 44,973 1.74 111.7 261 Ni-2 MAO — 20.00 34 151.6 11,411 82,865 45,131 1.84 114.0 262 Ni-3 MAO — 20.00 39 145.2 9,588 86,959 48,074 1.81 114.0 263 Co-1 MAO — 20.00 102 118.4 2,959 4,472 3,106 1.44 117.4 264 Ni-6 MAO — 20.00 39 151.4 9,982 52,523 25,759 2.04 122.5 265 Ni-1 MAO A1 19.78 40 158.1 10,026 80,025 46,375 1.73 113.1 266 Ni-2 MAO A1 19.78 34 157.2 11,627 75,165 43,170 1.74 110.7 267 Ni-3 MAO A1 19.78 38 149.6 10,053 80,174 46,800 1.71 112.1 268 Co-1 MAO A1 19.78 123 141.0 2,916 4,306 3,070 1.40 122.6 269 Ni-6 MAO A1 19.78 52 157.8 7,748 53,118 27,358 1.94 122.7 270 Ni-1 MAO A1 19.78 37 152.2 10,460 74,189 44,992 1.65 114.8 271 Ni-2 MAO A1 19.78 34 152.7 11,532 72,435 44,968 1.61 109.4 272 Ni-3 MAO A1 19.78 38 146.1 9,787 77,929 45,657 1.71 113.1 273 Co-1 MAO A1 19.78 101 106.3 2,681 4,352 3,078 1.41 147.6 274 Ni-6 MAO A1 19.78 55 160.4 7,377 51,138 26,817 1.91 122.8 275 Ni-1 MAO A2 19.78 33 155.2 11,791 69,847 43,371 1.61 110.4 276 Ni-2 MAO A2 19.78 33 158.2 12,385 67,189 41,846 1.61 108.7 277 Ni-3 MAO A2 19.78 35 147.4 10,618 72,646 45,636 1.59 109.4 278 Co-1 MAO A2 19.78 119 104.5 2,243 4,282 2,978 1.44 123.6 279 Ni-6 MAO A2 19.78 36 146.9 10,519 50,696 28,162 1.80 121.1 280 Ni-1 MAO A2 19.78 35 155.2 11,327 71,985 42,811 1.68 111.3 281 Ni-2 MAO A2 19.78 32 156.8 12,428 71,752 42,883 1.67 111.4 282 Ni-3 MAO A2 19.78 36 149.7 10,702 73,112 43,215 1.69 112.4 283 Co-1 MAO A2 19.78 125 104.5 2,135 4,139 2,995 1.38 124.3 284 Ni-6 MAO A2 19.78 37 150.7 10,479 50,445 27,533 1.83 121.4 285 Ni-1 TMA A2 19.78 47 139.9 7,610 75,851 47,421 1.60 113.8 286 Ni-2 TMA A2 19.78 44 146.6 8,385 66,872 41,129 1.63 113.5 287 Ni-3 TMA A2 19.78 52 137.2 6,724 75,789 48,418 1.57 109.5 288 Co-1 TMA A2 19.78 900 14.0 40 — — — — 289 Ni-6 TMA A2 19.78 41 142.0 8,733 52,146 28,958 1.80 120.5 290 Ni-1 TMA A2 19.78 47 137.6 7,387 77,176 49,243 1.57 110.4 291 Ni-2 TMA A2 19.78 43 148.6 8,869 71,239 44,054 1.62 108.2 292 Ni-3 TMA A2 19.78 50 133.1 6,739 78,985 51,147 1.54 112.0 293 Co-1 TMA A2 19.78 900 18.5 52 3,968 2,788 1.42 96.8 294 Ni-6 TMA A2 19.78 40 141.9 8,996 52,910 29,557 1.79 121.2 Standard Conditions: TMC (0.20 μmol) delivered as a 100 μL of a 0.002 M solution in toluene; 10 wt % Albemarle MAO when used delivered as a 0.3 M solution in toluene; TMA when used delivered as a 0.2 M solution in toluene; A1 (0.22 μmol) when used delivered as a 110 μL of a 0.002 M solution in toluene; A2 (0.22 μmol) when used delivered as 733.3 μL of a 0.0003 M solution in toluene; # Al/M molar ratio = 100 for runs with MAO only, 99 for runs with mixed activators; B/M molar ratio = 1.1 when second activator was used; Toluene was used as the reactor solvent and delivered to the reactor for a total volume of 5 mL; reaction temperature, 40° C.; ethylene gauge pressure 7.07 atmospheres; Activators: A1 = tris(perfluorophenyl)boron, A2 = dimethylanilinium tetrakis(perfluorophenyl)borate, MAO = methylalumoxane (10 wt % in toluene), TMA = trimethyl alum *When Activator 2 was used, Activator 1 was the co-activator.

TABLE 12 (Ni-1, Ni-2, Ni-6 with MAO or MAO/A1 or MAO/A2 or TMA/A1 or TMA/A2). Rxn Activator Activator A1/M time Polymer Tm Run # TMC 1* Activator 2 1 μmol molar (sec) (mg) Activity Mw Mn MWD (° C.) 295 Ni-1 MAO A1 1.78 9 54 156.8 7,426 91,817 57,959 1.58 118.4 296 Ni-1 MAO A2 1.78 9 44 154.7 9,036 87,230 56,362 1.55 115.9 297 Ni-1 MAO — 2.00 10 42 146.9 8,984 91,234 57,485 1.59 117.8 298 Ni-1 MAO — 2.00 10 118 157.2 3,389 102,189 63,036 1.62 118.7 299 Ni-1 MAO A2 1.78 9 47 149.8 8,132 86,329 55,552 1.55 115.1 300 Ni-1 MAO A1 1.78 9 55 160.2 7,420 98,673 62,638 1.58 117.7 301 Ni-1 MAO A1 4.78 24 58 176.7 7,785 91,826 57,903 1.59 117.8 302 Ni-1 MAO A2 4.78 24 45 159.2 8,971 86,598 56,189 1.54 115.3 303 Ni-1 MAO — 5.00 25 43 161.5 9,529 93,925 62,011 1.51 116.5 304 Ni-1 MAO — 5.00 25 78 181.4 5,951 101,465 65,948 1.54 117.9 305 Ni-1 MAO A2 4.78 24 48 162.6 8,577 82,796 53,200 1.56 115.0 306 Ni-1 MAO A1 4.78 24 59 174.4 7,531 98,413 63,468 1.55 119.0 307 Ni-1 MAO A1 9.78 49 40 184.5 11,845 81,899 51,244 1.60 116.3 308 Ni-1 MAO A2 9.78 49 44 165.6 9,628 81,913 50,964 1.61 116.2 309 Ni-1 MAO — 10.00 50 48 162.4 8,590 82,919 52,189 1.59 116.1 310 Ni-1 MAO — 10.00 50 50 184.1 9,351 82,990 51,866 1.60 116.8 311 Ni-1 MAO A2 9.78 49 44 168.9 9,733 78,871 49,032 1.61 117.2 312 Ni-1 MAO A1 9.78 49 53 165.0 7,933 88,849 56,049 1.59 117.6 313 Ni-1 MAO A1 14.78 74 94 216.9 5,880 89,040 55,050 1.62 115.2 314 Ni-1 MAO — 15.00 75 54 182.3 8,523 83,492 50,332 1.66 117.1 315 Ni-1 MAO — 15.00 75 45 193.1 11,020 83,007 51,361 1.62 116.6 316 Ni-1 MAO A2 14.78 74 45 174.0 9,917 77,017 47,454 1.62 115.4 317 Ni-1 MAO A1 14.78 74 53 174.5 8,432 88,481 55,333 1.60 116.7 318 Ni-6 MAO A1 1.78 9 90 163.1 4,611 54,731 31,877 1.72 125.5 319 Ni-6 MAO A2 1.78 9 58 154.7 6,779 53,679 32,146 1.67 125.0 320 Ni-6 MAO — 2.00 10 58 145.6 6,442 52,444 30,648 1.71 124.3 321 Ni-6 MAO — 2.00 10 127 164.0 3,275 57,618 32,354 1.78 124.9 322 Ni-6 MAO A2 1.78 9 51 150.2 7,492 50,094 29,503 1.70 123.7 323 Ni-6 MAO A1 1.78 9 76 154.8 5,212 56,174 32,675 1.72 125.6 324 Ni-6 MAO A1 4.78 24 66 172.6 6,686 52,356 29,541 1.77 125.8 325 Ni-6 MAO A2 4.78 24 61 159.3 6,664 52,121 31,381 1.66 124.6 326 Ni-6 MAO — 5.00 25 43 158.3 9,419 48,622 29,054 1.67 124.7 327 Ni-6 MAO — 5.00 25 147 176.9 3,056 61,161 33,747 1.81 122.2 328 Ni-6 MAO A2 4.78 24 67 154.2 5,883 51,920 30,426 1.71 124.2 329 Ni-6 MAO A1 4.78 24 71 168.9 6,060 56,700 32,419 1.75 126.0 330 Ni-6 MAO A1 9.78 49 111 189.8 4,354 61,991 33,306 1.86 126.7 331 Ni-6 MAO A2 9.78 49 80 158.9 5,029 57,716 34,165 1.69 126.3 332 Ni-6 MAO — 10.00 50 79 154.8 4,963 59,840 33,905 1.76 127.1 333 Ni-6 MAO — 10.00 50 75 154.5 5,261 58,395 33,508 1.74 125.0 334 Ni-6 MAO A2 9.78 49 68 158.5 5,913 55,689 32,052 1.74 124.9 335 Ni-6 MAO A1 9.78 49 75 151.4 5,163 62,699 36,307 1.73 125.3 336 Ni-6 MAO A1 14.78 74 110 193.3 4,469 59,693 32,179 1.86 130.0 337 Ni-6 MAO A2 14.78 74 69 168.7 6,250 56,895 32,996 1.72 122.9 338 Ni-6 MAO — 15.00 75 90 166.0 4,713 62,338 35,443 1.76 125.6 339 Ni-6 MAO — 15.00 75 117 180.0 3,905 63,200 34,756 1.82 124.8 340 Ni-6 MAO A2 14.78 74 61 169.0 7,070 52,059 30,139 1.73 122.1 341 Ni-6 MAO A1 14.78 74 90 178.0 5,060 64,214 36,384 1.76 124.0 342 Ni-1 TMA A1 2.00 10 157 103.1 1,671 146,455 98,919 1.48 112.2 343 Ni-6 TMA A1 2.00 10 275 80.9 750 106,140 69,965 1.52 124.8 344 Ni-2 TMA A1 2.00 10 375 54.5 370 188,129 124,447 1.51 114.7 345 Ni-2 TMA A1 2.00 10 181 110.6 1,555 149,665 100,009 1.50 110.8 346 Ni-6 TMA A1 2.00 10 256 74.9 745 105,130 68,035 1.55 125.8 347 Ni-1 TMA A1 2.00 10 406 73.1 458 194,305 129,381 1.50 116.8 348 Ni-1 TMA A1 5.00 25 124 135.0 2,770 115,795 77,806 1.49 112.5 349 Ni-6 TMA A1 5.00 25 207 129.2 1,588 89,879 57,408 1.57 120.9 350 Ni-2 TMA A1 5.00 25 151 120.3 2,034 130,633 87,091 1.50 110.7 351 Ni-2 TMA A1 5.00 25 135 132.6 2,507 124,950 84,996 1.47 112.5 352 Ni-6 TMA A1 5.00 25 166 118.9 1,823 88,781 57,264 1.55 123.3 353 Ni-1 TMA A1 5.00 25 143 114.3 2,031 147,041 98,116 1.50 109.5 354 Ni-1 TMA A1 10.00 50 87 141.8 4,136 96,514 62,825 1.54 113.4 355 Ni-6 TMA A1 10.00 50 231 139.6 1,537 64,938 39,570 1.64 122.1 356 Ni-2 TMA A1 10.00 50 75 144.7 4,896 92,480 60,169 1.54 113.2 357 Ni-2 TMA A1 10.00 50 88 143.8 4,148 104,302 70,171 1.49 112.2 358 Ni-6 TMA A1 10.00 50 170 135.5 2,027 62,697 38,252 1.64 135.4 359 Ni-1 TMA A1 10.00 50 91 146.8 4,085 103,151 67,739 1.52 113.5 360 Ni-1 TMA A1 15.00 75 109 145.7 3,397 96,471 62,387 1.55 111.9 361 Ni-6 TMA A1 15.00 75 192 142.4 1,885 64,553 38,830 1.66 122.0 362 Ni-2 TMA A1 15.00 75 75 151.0 5,113 90,443 58,800 1.54 124.0 363 Ni-2 TMA A1 15.00 75 80 142.6 4,552 94,299 61,064 1.54 112.9 364 Ni-6 TMA A1 15.00 75 130 137.7 2,691 61,719 37,891 1.63 122.0 365 Ni-1 TMA A1 15.00 75 98 148.5 3,868 101,049 65,521 1.54 112.4 366 Ni-1 TMA A2 2.00 10 149 149.9 2,553 102,410 66,282 1.55 114.0 367 Ni-6 TMA A2 2.00 10 901 140.1 396 90,418 57,349 1.58 122.7 368 Ni-2 TMA A2 2.00 10 454 123.1 690 156,390 103,163 1.52 111.6 369 Ni-2 TMA A2 2.00 10 164 139.0 2,157 120,844 80,106 1.51 114.4 370 Ni-6 TMA A2 2.00 10 300 121.8 1,032 100,174 64,285 1.56 122.9 371 Ni-1 TMA A2 2.00 10 321 115.3 915 156,978 104,544 1.50 113.1 372 Ni-1 TMA A2 5.00 25 118 143.3 3,086 102,604 67,939 1.51 115.3 373 Ni-6 TMA A2 5.00 25 757 150.0 504 76,173 46,002 1.66 124.2 374 Ni-2 TMA A2 5.00 25 165 136.8 2,111 114,237 75,489 1.51 114.3 375 Ni-2 TMA A2 5.00 25 142 139.5 2,503 113,012 74,812 1.51 114.9 376 Ni-6 TMA A2 5.00 25 385 146.3 968 83,081 53,432 1.55 122.6 377 Ni-1 TMA A2 5.00 25 189 136.4 1,834 126,623 84,553 1.50 114.1 378 Ni-1 TMA A2 10.00 50 115 153.6 3,399 94,083 60,330 1.56 122.2 379 Ni-6 TMA A2 10.00 50 677 157.8 593 70,837 41,099 1.72 125.5 380 Ni-2 TMA A2 10.00 50 170 150.2 2,249 101,164 65,306 1.55 115.8 381 Ni-2 TMA A2 10.00 50 189 156.0 2,096 97,868 62,683 1.56 116.8 382 Ni-6 TMA A2 10.00 50 464 151.6 831 69,995 41,589 1.68 124.7 383 Ni-1 TMA A2 10.00 50 129 142.0 2,806 110,684 73,014 1.52 114.9 384 Ni-1 TMA A2 15.00 75 114 153.4 3,425 93,140 59,083 1.58 119.3 385 Ni-6 TMA A2 15.00 75 170 152.4 2,281 61,974 37,256 1.66 125.5 386 Ni-2 TMA A2 15.00 75 120 143.0 3,034 97,854 63,411 1.54 115.6 387 Ni-2 TMA A2 15.00 75 109 144.5 3,358 98,526 63,446 1.55 114.8 388 Ni-6 TMA A2 15.00 75 125 144.4 2,929 60,326 36,295 1.66 125.9 389 Ni-1 TMA A2 15.00 75 123 146.2 3,032 101,704 65,386 1.56 114.1 Standard Conditions: TMC (0.20 μmol) delivered as a 100 μL of a 0.002 M solution in toluene; 10 wt % MAO in toluene when used delivered as a 0.0597 M solution in toluene; TMA when used delivered as a 0.05 M solution in toluene; A1 (0.22 μmol) when used delivered as a 110 μL of a 0.002 M solution in toluene; # A2 (0.22 μmol) when used delivered as 733.3 μL of a 0.0003 M solution in toluene; B/M molar ratio = 1.1 when second activator was used; Toluene was used as the reactor solvent and delivered to the reactor for a total volume of 5 mL; reaction temperature, 40° C.; ethylene gauge pressure 7.07 atmospheres; Activators: A1 = tris(perfluorophenyl)boron, A2 = dimethylanilinium tetrakis(perfluorophenyl)borate, MAO = methylalumoxane, TMA = trimethyl aluminum. *When Activator 2 was used, Activator 1 was the co-activator.

TABLE 13 Supported compound ethylene polymerizations (S-1, S-2) - Part A. Support Pol- Run Used Activator Activator Time ymer # Support (g) 10 wt % (ml) (hr) (g) Activity 390¹ S-1 0.70 MAO 1.3 0.01 15.1 31,634 391² S-1 0.35 MAO 0.65 0.01 15.9 33,378 392 S-1 0.15 MAO 0.28 0.25 8.1 1,930 393 S-1 0.15 MAO 0.28 0.25 8.7 2,046 394 S-2 0.15 MAO 0.28 0.25 14.5 3,477 395 S-2 0.15 MAO 0.28 0.25 4.9 1,184 396 S-2 0.15 MAO 0.28 0.25 3.4 803 ¹The reactor was shut down after 22 seconds because of a 12° C. exotherm. ²The reactor was shut down after 44 seconds because of a 12° C. exotherm.

TABLE 14 Supported compound ethylene polymerizations (S-1, S-2) - Part B. Run # MW Mn MWD Branching Vinylenes Trisubs Vinyls Vinylidenes 390 — — — — — — — — 391 — — — — — — — — 392 108,954 41,572 2.6 4.8 0.03 0.02 0.30 0 393 109,495 42,238 2.6 4.7 0.05 0.02 0.22 0 394 114,864 41,287 2.8 4.9 0.05 0.01 0.30 0 395 119,251 40,109 3.0 4.5 0.02 0.02 0.29 0 396 126,662 37,059 3.4 4.2 0.03 0.06 0.26 0

TABLE 15 Additional ethylene polymerizations (Ni-1, Ni-2, Ni-3, Ni-8, S-2) with MAO or MAO/A1 - Part A μmol Toluene Activator¹ C₂H₄ Time Polymer Run # TMC TMC (mL) (molar A1/M or B/M) (atm)³ T (° C.) (hr) (g) 397 Ni-1 1.53 150 MAO (1000) 3.40 80 1.0 0.17 398 Ni-1 15.3 150 MAO (1000) 34.03 80 0.5 15.0 399 Ni-1 15.3 150 MAO (50) + A1 (40) 34.03 80 0.5 14.5 400 Ni-3 14.0 150 MAO (1000) 3.40 80 0.5 0.404 401 Ni-3 14.0 150 MAO (1000) 34.03 80 0.5 9.0 402 Ni-2 13.8 150 MAO (1000) 3.40 80 0.5 1.18 403 Ni-2 13.8 150 MAO (1000) 34.03 80 0.5 9.4 404 Ni-8 5.0 25 MMAO (1000) 8.17 40 20.0 2.56 405² S-2 5.0 25 MMAO (1000) 8.17 40 20.0 1.8 C49 — — 25 MMAO (1000) 8.17 40 20.0 0.53 ¹MAO = 30 wt % methylalumoxane; MMAO = 7 wt % modified methylalumoxane; A1 = tris(perfluorophenyl)boron. ²S-2 loading of 16.6 μmol Ni-1/g silica; polymer yield corrected for residual silica. ³Measured as gauge pressure.

TABLE 16 Additional ethylene polymerizations (Ni-1, Ni-2, Ni-3, Ni-8, S-2 with MAO or MAO/A1 - Part B Run# Mw Mn MWD¹ Tm (° C.)² 397 112,710 10,400 10.8 (bimodal) 132.4 398 53,980 14,030 3.85 (bimodal) 114.5 (broad)  399³ 56,340 8,420 6.69 116.1 (low-T sh) 400 76,070 9,620 7.91 (low-Mn sh) 128.6 401 61,980 12,940 4.79 118.0 (low-T sh) 402 45,360 6,580 6.89 (high-Mn sh) 128.0 403 76,680 13,560 5.66 106.6, 124.9 404 53,310 15,210 3.51 105.7, 123.5 (weak) 405 113,680 23,550 4.82 114.5 (low-T sh, weak) C49 29,420 12,930 2.27 131.2 ¹low-Mn sh = shoulder on the low Mn side of the Mn; high-Mn sh = shoulder on the high Mn side of the Mn. ²low-T sh = shoulder on the low temperature side of the Tm. ³Branching by ¹³C NMR was measured for example 399; the numbers are reported as branches per 1000 C: 22.9 C₁, 4.2 C₂, 1.5 C₃, 4.8 C₄ ⁺; olefin end-groups by ¹H NMR were determined for example 399 and are reported as relative mol %: 54.7% vinyl: 45.3% vinylene.

TABLE 17 Ethylene polymerizations carried out in the presence of cyclohexene (Ni-1, Ni-2, Ni-3, Ni-8, Ni—Br with MAO¹) - Part A μmol Toluene Al/M cH² C₂H₄ Polymer Run # TMC TMC (mL) molar (mmol) (atm)³ T (° C.) Time (hr) (g) 406 Ni-1 15.3 150 1000 48.7 6.81 80 1.0 5.0 407 Ni-1 15.3 150 1000 48.7 34.03 80 1.0 10.3 408 Ni-3 14.0 150 1000 48.7 6.81 80 1.0 6.1 409 Ni-3 14.0 150 1000 48.7 34.03 80 1.0 6.34 410 Ni-3 14.0 150 1000 24.3 34.03 80 1.0 17.0 411 Ni-2 13.8 150 1000 48.7 6.81 80 1.0 4.0 412 Ni-2 13.8 150 1000 48.7 34.03 80 1.0 10.3 413 Ni-8 5.0 25 1000 10.0 8.17 40 20.0 2.81 C50 Ni—Br 16.8 150 1000 48.7 6.81 80 1.0 3.61 C51 Ni—Br 16.8 150 1000 48.7 34.03 80 1.0 2.84 ¹MAO = 30 wt % methylalumoxane. ²cH = cyclohexene. ³Measured as gauge pressure.

TABLE 18 Ethylene polymerizations carried out in the presence of cyclohexene (Ni-1, Ni-2, Ni-3, Ni-8, Ni—Br with MAO) - Part B mol % distribution of C₁:C₂:C₃:C₄ ⁺:33.5 ppm vinyl:vinylene:trisubs² Run # Mw Mn MWD Tm (° C.)¹ CH units/1000 C² (total olefins/1000 C) 406 51,240 17,240 2.97 111.1 (low-T sh) 31.5:3.7:2.0:7.5:5.0 50.0:50.0:0 (0.6) 407 64,400 21,040 3.06 118.6 (low-T sh) 18.8:3.6:0.8:3.5:6.0 62.3:37.7:0 (0.6) 408 41,020 16,370 2.51 110.8 (low-T sh) 35.8:4.1:2.2:8.4:4.8 27.8:49.4:22.8 (0.7) 409 80,330 19,660 4.09 123.0 (low-T sh) 21.2:3.1:1.1:4.4:4.6 ND:ND:ND (0) 410 76,330 13,140 5.81 101.5, 119.4 (broad) 25.9:4.2:1.7:7.8:5.8 ND:ND:ND (ND) 411 48,540 15,540 3.12 116.6 (low-T sh) 26.2:4.1:1.0:7.4:9.4 37.3:60.0:2.7 (0.7) 412 64,690 12,810 5.05 119.7 (low-T sh) 22.0:3.0:1.1:4.1:8.4 55.1:42.0:2.9 (0.7) 413 157,520 35,160 4.48 121.3 (broad) 12:1:<1:<1:ND ND:ND:ND (ND) C50 55,030 24,850 2.21  94.6 (broad) 21.4:2.3:1.1:4.0:4.0 56.1:43.9:0 (0.5) C51 99,050 27,230 3.64 126.5 (low-T sh) 7.4:1.0:0.2:1.4:1.0 76.0:24.0:0 (0.5) (1^(st) ht 114.6, 127.6) ¹low-T sh = shoulder on the low temperature side of the Tm. For example C51, the first DSC heat showed multiple melt peaks that condensed to one on the second heat. ²ND = not determined.

TABLE 19 Ethylene/cyclopentene copolymerization examples (Ni-6, Ni-8, Ni-9, S-2 with MAO or TMA/A1 - Part A μmol Toluene Activator¹ cP³ C₂H₄ T Time Polymer Run # TMC TMC (mL) (molar Al/M or B/M) (mmol) (atm)⁴ (° C.) (hr) (g) 414 Ni-6 5.0 25 MAO (1000) 10.0 8.17 60 20.0 0.950 415² S-2 5.0 25 MAO (1000) 10.0 8.17 60 20.0 0.641 416 Ni-8 5.0 25 MAO (1000) 10.0 8.17 60 20.0 0.870 417 Ni-9 5.0 25 MAO (1000) 10.0 8.17 60 20.0 2.80 C52 — — 25 MAO (5 mmol) 10.0 8.17 60 20.0 0.510 418 Ni-6 5.0 25 TMA (50) + A1 (1.1) 10.0 8.17 60 20.0 0.005 419 Ni-9 5.0 25 TMA (50) + A1 (1.1) 10.0 8.17 60 20.0 0.750 C53 — — 25 TMA (250 μmol) + A1 (5.5 mmol) 10.0 8.17 60 20.0 0 ¹MAO = 30 wt % methylalumoxane; TMA = trimethyl aluminum; A1 = tris (perfluorophenyl)boron. ²S-2 loading of 16.6 μmol Ni-1/g silica; polymer yield corrected for residual silica. ³cP = cyclopentene. ⁴Measured as gauge pressure.

TABLE 20 Ethylene/cyclopentene copolymerization examples (Ni-6, Ni-8, Ni-9, S-2 with MAO or TMA/A1 - Part B Mol % C₁:C₂:C₃:C₄ ⁺/ Run # Mw¹ Mn¹ MWD¹ Tm(° C.)² cp^(2,3) 1000 C² 414 22,010 6,550 3.36 127.2, 113.0 (low-T sh) 2.5 14.7:1.4:0.7:0.7 468,060 351,760 1.33 415 36,400 17,140 2.09 130.0 0.6 15.9:1.9:0.6:0 537,910 296,300 1.82 416 42,600 16,340 2.61 127.9 (1^(st) ht 112.8, 128.6) 1.1 20.8:3.0:1.7:6.3 604,460 441,060 1.37 417 74,780 32,080 2.33 92.0 0.7 34.0:3.0:2.4:3.6 C52 678,770 400,550 1.70 131.9 0.0 ND 418 ND ND ND ND ND ND 419 3,030 1,560 1.94 77.0, 94.6 (v br) 0.5 25.4:4.5:1.5:11.7⁴ 40,200 24,000 1.68 C53 — — — — — — ¹Bimodal; values in italics correspond to the second component. For examples 414, 416, and 419, this represents a minor portion of the material; for example 415, the two components were comparable. For example 419, the lower-MW component was itself bimodal in nature. ²ND = not determined; low-T sh = shoulder on the low temperature side of the Tm; v br = very broad. For example 416, the first DSC heat showed multiple melt peaks that condensed to one on the second heat. ³cP = cyclopentene; incorporation in the polymer backbone was measured as 1,3-enchained units. ⁴1.2 C₄ branches via the —CH₂CH₂CH₂CH₃ (2B₄ CH₂) ¹³C NMR resonance at 23.4 ppm, and 10.5 C₅ ⁺ branches via the —CH₂CH₂CH₃ ¹³C NMR (2s CH₂) resonance at 22.6 ppm; 6.4 vinyls/1000 C (¹H NMR).

TABLE 21 Norbornene polymerization examples (Ni-6, Ni-8, Ni-9, Ni-10 with MAO or TMA/A1 - Part A. μmol Toluene Activator¹ NB² Time Polymer Run # TMC TMC (mL) (molar A1/M or B/M) (mmol) T (° C.)³ (hr) (g) 420 Ni-6 5.7 3.0 MAO (975) 14.4 RT 64.5 1.252 421 Ni-6 5.0 7.0 MAO (1140) 14.4 RT 16.0 0.963 422 Ni-9 5.3 3.0 MAO (1075) 13.7 RT 64.5 0.925 423 Ni-9 5.2 7.0 MAO (1062) 14.6 RT 16.0 0.314 424  Ni-10 5.1 7.0 MAO (1118) 14.1 RT 16.0 0.641 C54 — — 3.0 MAO (5.7 mmol) 14.7 RT 16.25 0.038 C55 — — 7.0 MAO (5.71 mmol) 14.7 RT 16.0 0.096 425 Ni-6 5.0 7.5 TMA (50) + A1 (1.1) 14.4 RT 16.0 0.980 426 Ni-8 5.0 7.5 TMA (50) + A1 (1.1) 14.4 RT 16.0 0.250 C56 — — 7.5 TMA (250 μmol) + A1 (5.5 mmol) 14.4 RT 16.0 0 ¹MAO = 30 wt % methylalumoxane; TMA = trimethyl aluminum; A1 = tris (perfluorophenyl)boron. ²NB = norbornene ³RT = room temperature (no thermal control).

TABLE 22 Norbornene polymerization examples (Ni-6, Ni-8, Ni-9, Ni-10 with MAO or TMA/A1 - Part B. Run# Mw Mn MWD 420 1,312,200 548,900 2.39  421¹ 1,677,490 929,150 1.81 422 1,633,560 949,750 1.72 423 2,180,840 1,425,260 1.53 424 2,072,040 1,287,670 1.61 C54 1,952,850 1,283,150 1.52 C55 2,284,570 1,562,250 1.46  425² 337,600 170,190 1.98  426² 456,620 199,800 2.29 C56 — — — ¹No Tg or Tm observed (−110 to 150° C.). ¹³C NMR (1,1,2,2-tetrachloroethane-d₂, 120° C.): δ 53.1, 52.3, 51.8, 51.1, 49.0, 48.6, 48.0, 47.4 (2 C, main chain CH), 44.6, 43.3, 42.3, 41.5, 40.2, 39.9, 39.0, 38.8 (2 C, ring CH), 37.9, 35.5 (1 C, ring # bridge CHCH₂CH), 31.9, 30.6 (2 C, ring CH₂) ppm. ¹H NMR (1,2-dichlorobenzene-d₄, 120° C.): δ 2.43, 2.33, 2.21, 1.90, 1.58, 1.25, 1.15 ppm. ²Also examined by ¹³C NMR; appeared to have higher syndiotacticity than polymer from example 421 as measured by (larger rr and mr resonances at 40-42 ppm and smaller mm resonances at 38-40 ppm (Wu, Q.; Lu, Y. J. Polym. Sci., Polym. Chem. Ed. 2002, 40, 1421).

While certain representative embodiments and details have been shown to illustrate the invention, it will be apparent to skilled artisans that various process and product changes from those disclosed in this application may be made without departing from this invention's scope, which the appended claims define.

All cited patents, test procedures, priority documents, and other cited documents are fully incorporated by reference to the extent that this material is consistent with this specification and for all jurisdictions in which such incorporation is permitted.

Certain features of the present invention are described in terms of a set of numerical upper limits and a set of numerical lower limits. This specification discloses all ranges formed by any combination of these limits. All combinations of these limits are within the scope of the invention unless otherwise indicated. 

1. A transition metal compound represented by the formula LMX wherein M is a Group 3 to 11 metal L is a bulky bidentate or tridentate neutral ligand that is bonded to M by two or three heteroatoms and at least one heteroatom is nitrogen; X is a substituted or unsubstituted catecholate ligand provided that the substituted catecholate ligand does not contain a 1,2-diketone functionality.
 2. The compound of claim 1 where M is a Group 8, 9, 10 or 11 metal.
 3. The compound of claim 1 wherein M is Fe, Ru, Os, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag or Au.
 4. The compound of claim 1 wherein M is Fe, Co, Ni or Pd.
 5. The compound of any of the above claims wherein L is not a ligand selected from the group consisting of: substituted and unsubstituted 2,2′-bipyridyl, 2,2′-biquinolinyl, 2,2′-bipyrazinyl, 1,10-phenanthroline, dipyridin-2-yl-amine, dipyridin-2-yl-methane, N′-(2-amino-ethyl)ethane-1,2-diamine, N¹-(3-amino-propyl)propane-1,3-diamine, ethane-1,2-diamine, propane-1,3-diamine, cyclohexane-1,2-diamine, N,N,N,N′-tetramethylethane-1,2-diamine, methyl-(2-methyliminoethylidene)amine, N,N′-bis(napthalen-1-ylmethylene)ethane-1,2-diamine, N,N ′-bis(napthalen-1-ylmethylene)propane-1,3-diaamine, N,N′-dibenzylidene-propane-1,3-diamine, N¹-napthalen-1-ylmethylene-ethane-1,2-diamine, 2-[(3-amino-propylimino)methyl]phenol, 2,4,4-trimethyl-1,5,9-triaza-cyclododec-1-ene, 1,4,7-trimethyl-[1,4,7]triazonane, [2,2′;6′2″]terpyridine, N-[2-dimethylaminoethyl)-N,N′,N ′-trimethylethane-1,2-diaamine, cyclopenta[2,1-b;3,4-b′]dipyridin-5-one, 2-(2-pyridylsulfanyl)pyridine, 2-(2-pyridyloxy)pyridine, benzyl-bis(pyridin-2-ylmethyl)amine, 2-pyridin-2-yl-quinoxaline, N′-ethylidene-ethane-1,2-diamine, and bis(1H-benzoimidazol-2-ylmethyl)amine where substitution refers to replacing one or more existing hydrogen atoms bonded to carbon with another atom or group of atoms; and 1,4-diaza-1,3-butadiene ligands containing substituents in the 2 and or 3 positions containing trihydrocarbylsiloxy groups.
 6. The compound of any of the above claims where L is represented by the formulae:

where each E is, independently, a Group 15 element that is bonded to M, provided that at least one E is nitrogen; G is a Group 16 element that is bonded to M; A is a bridging group containing a Group 13-16 element and an atom within A may optionally be bonded to M; x is 0 or 1; R¹ is, independently, a bulky hydrocarbyl, substituted bulky hydrocarbyl, bulky halocarbyl, or substituted bulky halocarbyl; R² is, independently, hydrogen, or a hydrocarbyl, substituted hydrocarbyl, halocarbyl, or substituted halocarbyl provided that a substituted hydrocarbyl is not substituted with trihydrocarbylsiloxy; R³ is, independently, hydrogen, or a hydrocarbyl, substituted hydrocarbyl, halocarbyl, or substituted halocarbyl provided that a substituted hydrocarbyl is not substituted with trihydrocarbylsiloxy, or R³is a substituted hydrocarbyl group containing a heteroatom or silicon atom directly bonded to G, E or the indicated carbon atom; R²² is, independently, hydrogen, or a hydrocarbyl, substituted hydrocarbyl, halocarbyl, or substituted halocarbyl provided that a substituted hydrocarbyl is not substituted with trihydrocarbylsiloxy; and where R¹, R² and/or R³ groups on the same atom, adjacent atoms or those separated by one additional atom may join together to form a substituted or unsubstituted, saturated, partially unsaturated or aromatic cyclic or polycyclic ring structure provided that for L1, both pair of R¹ and R² do not join to form a substituted or unsubstituted pyridine, pyrazine, pyrimidine or benzimidazole ring; R²² and R³ may join together to form a substituted or unsubstituted, saturated, partially unsaturated or aromatic heterocyclic ring structure provided that for L21 and L22, R¹ and R² do not join to form a substituted or unsubstituted pyridine, pyrazine, pyrimidine or benzimidazole ring; and two R² bonded to the same atom together may form an -one (═O), a thione (═S), an -imine (═NR′″), or a -carbene (═CR′″₂) group where R′″ is independently, hydrogen, hydrocarbyl, substituted hydrocarbyl, halocarbyl or substituted halocarbyl and two or more R′″ on the same carbon may join together to form a substituted or unsubstituted, saturated, partially unsaturated, or aromatic cyclic or polycyclic substituent.
 7. The compound of any of claims 1, 2, 3, 4, or 5 where L is represented by the formulae L*1 to L*410: where R¹ is, independently, a bulky hydrocarbyl, substituted bulky hydrocarbyl, bulky halocarbyl, or substituted bulky halocarbyl; R² is, independently, hydrogen, or a hydrocarbyl, substituted hydrocarbyl, halocarbyl, or substituted halocarbyl provided that a substituted hydrocarbyl is not substituted with trihydrocarbylsiloxy; R³ is, independently, hydrogen, or a hydrocarbyl, substituted hydrocarbyl, halocarbyl, or substituted halocarbyl provided that a substituted hydrocarbyl is not substituted with trihydrocarbylsiloxy, or R³ is a substituted hydrocarbyl group containing a heteroatom or silicon atom directly bonded to G, E or the indicated carbon atom; R²² is, independently, hydrogen, or a hydrocarbyl, substituted hydrocarbyl, halocarbyl, or substituted halocarbyl provided that a substituted hydrocarbyl is not substituted with trihydrocarbylsiloxy; and where R¹, R² and/or R³ groups on the same atom, adjacent atoms or those separated by one additional atom may join together to form a substituted or unsubstituted, saturated, partially unsaturated or aromatic cyclic or polycyclic ring structure provided that for L1, both pair of R¹ and R² do not join to form a substituted or unsubstituted pyridine, pyrazine, pyrimidine or benzimidazole ring; R²² and R³ may join together to form a substituted or unsubstituted, saturated, partially unsaturated or aromatic heterocyclic ring structure provided that for L21 and L22, R¹ and R² do not join to form a substituted or unsubstituted pyridine, pyrazine, pyrimidine or benzimidazole ring; and two R² bonded to the same atom together may form an -one (═O), a thione (═S), an -imine (═NR′″), or a -carbene (═CR′″₂) group where R′″ is independently, hydrogen, hydrocarbyl, substituted hydrocarbyl, halocarbyl or substituted halocarbyl and two or more R′″ on the same carbon may join together to form a substituted or unsubstituted, saturated, partially unsaturated, or aromatic cyclic or polycyclic substituent.
 8. The compound of claim 6 or 7, where R¹ is selected from the group consisting of: all isomers and hydrocarbyl substituted isomers of propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, nonadecyl, eicosyl, heneicosyl, docosyl, tricosyl, tetracosyl, pentacosyl, hexacosyl, heptacosyl, octacosyl, nonacosyl, triacontyl, propenyl, butenyl, pentenyl, hexenyl, heptenyl, octenyl, nonenyl, decenyl, undecenyl, dodecenyl, tridecenyl, tetradecenyl, pentadecenyl, hexadecenyl, heptadecenyl, octadecenyl, nonadecenyl, eicosenyl, heneicosenyl, docosenyl, tricosenyl, tetracosenyl, pentacosenyl, hexacosenyl, heptacosenyl, octacosenyl, nonacosenyl, triacontenyl, propynyl, butynyl, pentynyl, hexynyl, heptynyl, octynyl, nonynyl, decynyl, undecynyl, dodecynyl, tridecynyl, tetradecynyl, pentadecynyl, hexadecynyl, heptadecynyl, octadecynyl, nonadecynyl, eicosynyl, heneicosynyl, docosynyl, tricosynyl, tetracosynyl, pentacosynyl, hexacosynyl, heptacosynyl, octacosynyl, nonacosynyl, and triacontynyl; perfluoropropyl, perfluorobutyl, perfluoropentyl, perfluorohexyl, perfluoroheptyl, perfluorooctyl, perfluorononyl, perfluorodecyl, perfluoroundecyl, perfluorododecyl, perfluorotridecyl, perfluorotetradecyl, perfluoropentadecyl, perfluorohexadecyl, perfluoroheptadecyl, perfluorooctadecyl, perfluorononadecyl, perfluoroeicosyl, perfluoroheneicosyl, perfluorodocosyl, perfluorotricosyl, perfluorotetracosyl, perfluoropentacosyl, perfluorohexacosyl, perfluoroheptacosyl, perfluorooctacosyl, perfluorononacosyl, perfluorotriacontyl, perfluorobutenyl, perfluorobutynyl, fluoropropyl, fluorobutyl, fluoropentyl, fluorohexyl, fluoroheptyl, fluorooctyl, fluorononyl, fluorodecyl, fluoroundecyl, fluorododecyl, fluorotridecyl, fluorotetradecyl, fluoropentadecyl, fluorohexadecyl, fluoroheptadecyl, fluorooctadecyl, fluorononadecyl, fluoroeicosyl, fluoroheneicosyl, fluorodocosyl, fluorotricosyl, fluorotetracosyl, fluoropentacosyl, fluorohexacosyl, fluoroheptacosyl, fluorooctacosyl, fluorononacosyl, fluorotriacontyl, difluorobutyl, trifluorobutyl, tetrafluorobutyl, pentafluorobutyl, hexafluorobutyl, heptafluorobutyl, octafluorobutyl; methoxypropyl, methoxybutyl, methoxypentyl, methoxyhexyl, methoxyheptyl, methoxyoctyl, methoxynonyl, methoxydecyl, methoxyundecyl, methoxydodecyl, methoxytridecyl, methoxytetradecyl, methoxypentadecyl, methoxyhexadecyl, methoxyheptadecyl, methoxyoctadecyl, methoxynonadecyl, methoxyeicosyl, methoxyheneicosyl, methoxydocosyl, methoxytricosyl, methoxytetracosyl, methoxypentacosyl, methoxyhexacosyl, methoxyheptacosyl, methoxyoctacosyl, methoxynonacosyl, methoxytriacontyl, butoxypropyl, butoxybutyl, butoxypentyl, butoxyhexyl, butoxyheptyl, butoxyoctyl, butoxynonyl, butoxydecyl, butoxyundecyl, butoxydodecyl, butoxytridecyl, butoxytetradecyl, butoxypentadecyl, butoxyhexadecyl, butoxyheptadecyl, butoxyoctadecyl, butoxynonadecyl, butoxyeicosyl, butoxyheneicosyl, butoxydocosyl, butoxytricosyl, butoxytetracosyl, butoxypentacosyl, butoxyhexacosyl, butoxyheptacosyl, butoxyoctacosyl, butoxynonacosyl, butoxytriacontyl, dimethylaminopropyl, dimethylaminobutyl, dimethylaminopentyl, dimethylaminohexyl, dimethylaminoheptyl, dimethylaminooctyl, dimethylarninononyl, dimethylaminodecyl, dimethylaminoundecyl, dimethylaminododecyl, dimethylaminotridecyl, dimethylaminotetradecyl, dimethylaminopentadecyl, dimethylamninohexadecyl, dimethylaminoheptadecyl, dimethylaminooctadecyl, dimethylaminononadecyl, dimethylaminoeicosyl, dimethylaminoheneicosyl, dimethylaminodocosyl, dimethylaminotricosyl, dimethylaminotetracosyl, dimethylaminopentacosyl, dimethylaminohexacosyl, dimethylaminoheptacosyl, dirmethylraminooctacosyl, dimethylaminononacosyl, dimethylaminotriacontyl, trimethylsilylpropyl, trimethylsilylbutyl, trimethylsilylpentyl, trimethylsilylhexyl, trimethylsilylheptyl, trimethylsilyloctyl, trimethylsilylnonyl, trimethylsilyldecyl, trimethylsilylundecyl, trimethylsilyldodecyl, trimethylsilyltridecyl, trimethylsilyltetradecyl, trimethylsilylpentadecyl, trimethylsilylhexadecyl, trimethylsilylheptadecyl, trimethylsilyloctadecyl, trimethylsilylnonadecyl, trimethylsilyleicosyl, trimethylsilylheneicosyl, trimethylsilyldocosyl, trimethylsilyltricosyl, trimethylsilyltetracosyl, trimethylsilylpentacosyl, trimethylsilylhexacosyl, trimethylsilylheptacosyl, trimethylsilyloctacosyl, trimethylsilylnonacosyl, trimethylsilyltriacontyl, methylphenyl, dimethylphenyl, trimethylphenyl, tetramethylphenyl, pentamethylphenyl ethylphenyl, diethylphenyl, triethylphenyl, tetraethylphenyl, pentaethylphenyl, propylphenyl, dipropylphenyl, tripropylphenyl, tetrapropylphenyl, pentapropylphenyl butylphenyl, dibutylphenyl, tributylphenyl, tetrabutylphenyl, pentabutylphenyl, hexylphenyl, dihexylphenyl, trihexylphenyl, tetrahexylphenyl, pentahexylphenyl, dimethylethylphenyl, dimethylpropylphenyl, dimethylbutylphenyl, dimethylpentylphenyl, dimethylhexylphenyl, diethylmethylphenyl, diethylpropylphenyl, diethylbutylphenyl, diethylpentylphenyl, diethylhexylphenyl, dipropylmethylphenyl, dipropylethylphenyl, dipropylbutylphenyl, dipropylpentylphenyl, dipropylhexylphenyl, dibutylmethylphenyl, dibutylethylphenyl, dibutylpropylphenyl, dibutylpentylphenyl, dibutylhexylphenyl, methylethylphenyl, methylpropylphenyl, methylbutylphenyl, methylpentylphenyl, methylhexylphenyl, ethylpropylphenyl, ethylbutylphenyl, ethylpentylphenyl, ethylhexylphenyl, propylbutylphenyl, propylpentylphenyl, propylhexylphenyl, butylpentylphenyl, butylhexylphenyl, methoxyphenyl, ethoxyphenyl, propoxyphenyl, butoxyphenyl, pentoxyphenyl, hexoxyphenyl, dimethoxyphenyl, phenoxyphenyl, methylmethoxyphenyl, dimethylaminophenyl, dipropylaminophenyl, bis(dimethylamino)phenyl, methyl(dimethylamino)phenyl, trimethylsilylphenyl, trimethylgermylphenyl, trifluoromethylphenyl, bis(triflouromethyl)phenyl, trifluoromethoxyphenyl, halophenyl, dihalophenyl, trihalophenyl, tetrahalophenyl, and pentahalophenyl, halomethylphenyl, dihalomethylphenyl, trihalomethylphenyl, tetrahalomethylphenyl, haloethlyphenyl, dihaloethylphenyl, trihaloethylphenyl, tetrahaloethylphenyl, halopropylphenyl, dihalopropylphenyl, trihalopropylphenyl, tetrahalopropylphenyl, halobutylphenyl, dihalobutylphenyl, trihalobutylphenyl, tetrahalobutylphenyl, dihalodimethylphenyl, dihalo(trifluoromethyl)phenyl (where halo is, independently, fluoro, chloro, bromo and iodo), methylbenzyl, dimethylbenzyl, trimethylbenzyl, tetramethylbenzyl, pentamethylbenzyl ethylbenzyl, diethylbenzyl, triethylbenzyl, tetraethylbenzyl, pentaethylbenzyl, propylbenzyl, dipropylbenzyl, tripropylbenzyl, tetrapropylbenzyl, pentapropylbenzyl butylbenzyl, dibutylbenzyl, tributylbenzyl, tetrabutylbenzyl, pentabutylbenzyl, hexylbenzyl, dihexylbenzyl, trihexylbenzyl, tetrahexylbenzyl, pentahexylbenzyl, dimethylethylbenzyl, dimethylpropylbenzyl, dimethylbutylbenzyl, dimethylpentylbenzyl, dimethylhexylbenzyl, diethylmethylbenzyl, diethylpropylbenzyl, diethylbutylbenzyl, diethylpentylbenzyl, diethylhexylbenzyl, dipropylmethylbenzyl, dipropylethylbenzyl, dipropylbutylbenzyl, dipropylpentylbenzyl, dipropylhexylbenzyl, dibutylmethylbenzyl, dibutylethylbenzyl, dibutylpropylbenzyl, dibutylpentylbenzyl, dibutylhexylbenzyl, methylethylbenzyl, methylpropylbenzyl, methylbutylbenzyl, methylpentylbenzyl, methylhexylbenzyl, ethylpropylbenzyl, ethylbutylbenzyl, ethylpentylbenzyl, ethylhexylbenzyl, propylbutylbenzyl, propylpentylbenzyl, propylhexylbenzyl, butylpentylbenzyl, butylhexylbenzyl, methoxybenzyl, ethoxybenzyl, propoxybenzyl, butoxybenzyl, pentoxybenzyl, hexoxybenzyl, dimethoxybenzyl, phenoxybenzyl, methylmethoxybenzyl, dimethylaminobenzyl, dipropylaminobenzyl, bis(dimethylamino)benzyl, methyl(dimethylamino)benzyl, trifluoromethylbenzyl, bis(trifluoromethylbenzyl), trifluoromethyoxybenzyl, trimethylsilylbenzyl, bis(trimethylsilyl)benzyl, trimethylgermylbenzyl, diphenylmethyl, trimethylsilyl, trimethylgermyl, trimethylstannyl, trimethylplumbyl, triethylsilyl, triethylgermyl, dimethylethylsilyl, dimethylethylgermyl, diethylmethylsilyl, diethylmethylgermyl, triphenylsilyl, triphenylgermyl, triphenoxysilyl, triphenoxygermyl, trimethoxysilyl, trimethoxygermyl, triethoxysilyl, triethoxygermyl, and all isomers of tripropylsilyl, tripropylgermyl, tributylsilyl, tributylgermyl, tripropoxysilyl, tripropoxygermyl, tributoxysilyl, tributoxygermyl, tris(trifluornethyl)silyl, bis(perfluoromethyl)methylsilyl, pyrenyl, aceanthrylenyl, acenaphthylene, acephenanthrylenyl, azulenyl biphenylenyl, chrysenyl, coronenyl, fluoranthenyl, fluorenyl, heptacenyl, heptalenyl, heptaphenyl, hexacenyl, hexaphenyl, as-indacenyl, s-indecenyl, indenyl, ovalenyl, pentacenyl, pentalenyl, pentaphenyl, perylenyl, phenalenyl, phenanthrenyl, picenyl, pleiadenyl, pyranhrenyl, rubicenyl, naphthacenyl, tetraphenylenyl, trinaphthylenyl, triphenylenyl, hexahelicenyl, naphthyl, anthracenyl, dibenza[a,b]anthracenyl, indanyl, acenaphthenyl, cholanthrenyl, aceanthrenyl, acephenanthrenyl, 1,2,3,4-tetrahydronapthalene, fullerenyl, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cyclohexenyl, cycloheptyl, cyclooctyl, cyclononyl, cyclodecyl, cycloundecyl, and cyclododecyl, dimethylcyclohexyl, norbomyl, norbornenyl, adamantyl, cubanyl, prismanyl, spiro[4,5]decanyl, biphenyl, bicyclopentyl, terphenyl, quatercyclohexanyl, binaphthyl, binorbornyl, phenyl-terphenyl, 1,1-diphenylmethano, 1,1-dinapthyletheno, acridarsinyl, acridinyl, acridophosphinyl, 1H-acrindolinyl, anthrazinyl, anthyridinyl, arsanthridinyl, arsindolyl, arsindolizinyl, arsinolinyl, arsinolizinyl, benzofuranyl, carbazolyl, β-carbolinyl, chromenyl, thiochromenyl, cinnolinyl, furanyl, imidazolyl, indazolyl, indolyl, indolizinyl, isoarsindolyl, isoarsinolinyl, isobenzofuranyl, isochromenyl, isothiochromenyl, isoindolyl, isophosphindolyl, isophosphinolinyl, isoquinolinyl, isothiazolyl, isoxazolyl, naphthyridinyl, oxazolyl, perimidinyl, phenanthrazinyl, phenanthridinyl, phenanthrolinyl, phenazinyl, phosphanthridinyl, phosphindolyl, phosphindolizinyl, phosphinolizinyl, phthalazinyl, pteridinyl, phthaloperinyl, purinyl, pyranyl, thiopyranal, pyrazinyl, pyrazolyl, pyridazinyl, pyridinyl, pyrindinyl, pyrimidinyl, pyrrolyl, pyrrolizinyl, quinazolinyl, quindolinyl, 1H-quinindolinyl, quinolinyl, quinolizinyl, quinoxalinyl, selenophenyl, thebenidinyl, thiazolyl, thiophenyl, triphenodioxazinyl, triphenodithiazinyl, xanthenyl, chromanyl, thiochromanyl, imidazolidinyl, indolinyl, isochromanyl, isothiochromanyl, isoindolinyl, morpholinyl, piperazinyl, piperidinyl, pyrozolidinyl, pyrrolidinyl, quinuclidinyl, dimethylacridarsinyl, dimethylacridinyl, dimethylacridophosphinyl, dimethyl-1H-acrindolinyl, dimethylanthrazinyl, dimethylanthyridinyl, dimethylarsanthridinyl, dimethylarsindolyl, dimethylarsindolizinyl, dimethylarsinolinyl, dimethylarsinolizinyl, dibutylbenzofuranyl, dibutylcarbazolyl, dibutyl-β-carbolinyl, dibutylchromenyl, dibutylthiochromenyl, butylcinnolinyl, dibutylfuranyl, dimethylimidazolyl, dimethylindazolyl, dipropylindolyl, dipropylindolizinyl, dimethylisoarsindolyl, methylisoarsinolinyl, dimethylisobenzofuranyl, diphenylisochromenyl, dibutylisothiochromenyl, phenylisoindolyl, butylisophosphindolyl, dibutylisophosphinolinyl, dimethylisoquinolinyl, methylisothiazolyl, butylisoxazolyl, butylnaphthyridinyl, dimethyloxazolyl, methylphenylperimidinyl, tetrabutylphenanthrazinyl, propylphenanthridinyl, dibutylphenanthrolinyl, tetrarnethylphenazinyl, butylphosphanthridinyl, phenylphosphindolyl, dimethylphosphindolizinyl, methylphosphinolizinyl, dibutylphthalazinyl, trimethylpteridinyl, methylphthaloperinyl, dimethylpurinyl, dibutylpyranyl, dibutylthiopyranal, trimethylpyrazinyl, phenylpyrazolyl, dipropylpyridazinyl, dimethylpyridinyl, methylpropylpyrindinyl, triethylpyrimidinyl, dibutylpyrrolyl, diethylpyrrolizinyl, dibutylquinazolinyl, dibutylquindolinyl, dibutyl-1H-quinindolinyl, dimethylquinolinyl, propylquinolizinyl, methylquinoxalinyl, methylbutylselenophenyl, methylthebenidinyl, dimethylthiazolyl, trimethylthiophenyl, dibutyltriphenodioxazinyl, dibutyltriphenodithiazinyl, dibutylxanthenyl, trimethylchromanyl, dimethylthiochromanyl, dimethylimidazolidinyl, dimethylindolinyl, dibutylisochromanyl, dibutylisothiochromanyl, phenylisoindolinyl, dibutylmorpholinyl, dimethylpiperazinyl, dimethylpiperidinyl, dimethylpyrozolidinyl, dimethylpyrrolidinyl, bipyridyl, pyrido[2,1,6-de]quinolizinyl, hexamethylquinuclidinyl, 5,7-dioxa-6-phosphadibenzo[a,c]cycloheptene-6-oxide, and 9-oxa-10-phosphaphenanthrene-10-oxide.
 9. The compound of claim 6 where A is represented by the following formulae: R′₂C, R′₂Si, R′₂Ge, R′₂CCR′₂, R′₂CCR′₂CR′₂, R′₂CCR′₂CR′₂CR′₂, R′C═CR′, R′C═CR′CR′₂, R′₂CCR′═CR′CR′₂, R′C═CR′CR′═CR′, R′C═CR′CR′₂CR′₂, R′₂CSiR′₂, R′₂SiSiR′₂, R′₂CSiR′₂CR′₂, R′₂SiCF′₂SiR′₂, R′C═CR′SiR′₂, R′₂CGeR′₂, R′₂GeGeR′₂, R′₂CGeR′₂CR′₂, R′₂GeCR′₂GeR′₂, R′₂SiGeR′₂, R′C═CR′GeR′₂, R′B, R′₂C—BR′, R′₂C—BR′—CR′₂, R′N, R′P, O, S, Se, C(═O)C(═O), R′₂CC(═O), R′₂CC(═O)CR′₂, R′₂C—O—CR′₂, R′₂CR′₂C—O—CR′₂CR′₂, R′₂C—O—CR′₂CR′₂, R′₂C—O—CR′═CR′, R′₂C—S—CR′₂, R′₂CR′₂C—S—CR′₂CR′₂, R′₂C—S—CR′₂CR′₂, R′₂C—S—CR′═CR′, R′₂C—Se—CR′₂, R′₂CR′₂C—Se—CR′₂CR′₂, R′₂C—Se—CR′₂CR′₂, R′₂C—Se—CR′═CR′, R′₂C—N═CR′, R′₂C—NR′—CR′₂, R′₂C—NR′—CR′₂CR′₂, R′₂C—NR′—CR′═CR′, R′₂CR′₂C—NR′—CR′₂CR′₂, R′₂C—P═CR′, and R′₂C—PR′—CR′₂ where each R′ is, independently, hydrogen, hydrocarbyl, substituted hydrocarbyl, halocarbyl or substituted halocarbyl provided that a substituted hydrocarbyl is not substituted with trihydrocarbylsiloxy, and two or more R′ on the same carbon or adjacent R′ may join together to form a substituted or unsubstituted, saturated, partially unsaturated, or aromatic cyclic or polycyclic substituent.
 10. The compound of claim 6 where A is represented by the formulae:

where R″ is, independently, hydrogen, hydrocarbyl, substituted hydrocarbyl, halocarbyl or substituted halocarbyl provided that a substituted hydrocarbyl is not substituted with trihydrocarbylsiloxy, and two or more R″ on the same carbon or adjacent R″ may join together to form a substituted or unsubstituted, saturated, partially unsaturated, or aromatic cyclic or polycyclic substituent and where the bonding points are designated by the dots.
 11. The compound of claim 6 or 7 where R¹ is represented by the formulae:

where R¹⁰, R¹¹, R¹², and R¹³ are, independently, hydrogen, hydrocarbyl radicals, substituted hydrocarbyl radicals, halocarbyl radicals, substititued halocarbyl radicals, silylcarbyl radicals or polar radicals and R¹, R¹¹, R¹², and/or R¹³ on the same atom or adjacent atoms may join together to form a substituted or unsubstituted saturated, partially unsaturated or aromatic cyclic or polycyclic ring structure.
 12. The composition of claim 11 wherein R¹⁰, R¹¹, R¹², and R¹³ are, independently selected from the group consisting of: hydrogen, methyl, ethyl, ethenyl, ethynyl and all isomers of propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, nonadecyl, eicosyl, heneicosyl, docosyl, tricosyl, tetracosyl, pentacosyl, hexacosyl, heptacosyl, octacosyl, nonacosyl, triacontyl, propenyl, butenyl, pentenyl, hexenyl, heptenyl, octenyl, nonenyl, decenyl, undecenyl, dodecenyl, tridecenyl, tetradecenyl, pentadecenyl, hexadecenyl, heptadecenyl, octadecenyl, nonadecenyl, eicosenyl, heneicosenyl, docosenyl, tricosenyl, tetracosenyl, pentacosenyl, hexacosenyl, heptacosenyl, octacosenyl, nonacosenyl, triacontenyl, propynyl, butynyl, pentynyl, hexynyl, heptynyl, octynyl, nonynyl, decynyl, undecynyl, dodecynyl, tridecynyl, tetradecynyl, pentadecynyl, hexadecynyl, heptadecynyl, octadecynyl, nonadecynyl, eicosynyl, heneicosynyl, docosynyl, tricosynyl, tetracosynyl, pentacosynyl, hexacosynyl, heptacosynyl, octacosynyl, nonacosynyl, triacontynyl, perfluoropropyl, perfluorobutyl, perfluoropentyl, perfluorohexyl, perfluoroheptyl, perfluorooctyl, perfluorononyl, perfluorodecyl, perfluoroundecyl, perfluorododecyl, perfluorotridecyl, perfluorotetradecyl, perfluoropentadecyl, perfluorohexadecyl, perfluoroheptadecyl, perfluorooctadecyl, perfluorononadecyl, perfluoroeicosyl, perfluoroheneicosyl, perfluorodocosyl, perfluorotricosyl, perfluorotetracosyl, perfluoropentacosyl, perfluorohexacosyl, perfluoroheptacosyl, perfluorooctacosyl, perfluorononacosyl, perfluorotriacontyl, perfluorobutenyl, perfluorobutynyl, fluoropropyl, fluorobutyl, fluoropentyl, fluorohexyl, fluoroheptyl, fluorooctyl, fluorononyl, fluorodecyl, fluoroundecyl, fluorododecyl, fluorotridecyl, fluorotetradecyl, fluoropentadecyl, fluorohexadecyl, fluoroheptadecyl, fluorooctadecyl, fluorononadecyl, fluoroeicosyl, fluoroheneicosyl, fluorodocosyl, fluorotricosyl, fluorotetracosyl, fluoropentacosyl, fluorohexacosyl, fluoroheptacosyl, fluorooctacosyl, fluorononacosyl, fluorotriacontyl, difluorobutyl, trifluorobutyl, tetrafluorobutyl, pentafluorobutyl, hexafluorobutyl, heptafluorobutyl, octafluorobutyl, methoxypropyl, methoxybutyl, methoxypentyl, methoxyhexyl, methoxyheptyl, methoxyoctyl, methoxynonyl, methoxydecyl, methoxyundecyl, methoxydodecyl, methoxytridecyl, methoxytetradecyl, methoxypentadecyl, methoxyhexadecyl, methoxyheptadecyl, methoxyoctadecyl, methoxynonadecyl, methoxyeicosyl, methoxyheneicosyl, methoxydocosyl, methoxytricosyl, methoxytetracosyl, methoxypentacosyl, methoxyhexacosyl, methoxyheptacosyl, methoxyoctacosyl, methoxynonacosyl, methoxytriacontyl, butoxypropyl, butoxybutyl, butoxypentyl, butoxyhexyl, butoxyheptyl, butoxyoctyl, butoxynonyl, butoxydecyl, butoxyundecyl, butoxydodecyl, butoxytridecyl, butoxytetradecyl, butoxypentadecyl, butoxyhexadecyl, butoxyheptadecyl, butoxyoctadecyl, butoxynonadecyl, butoxyeicosyl, butoxyheneicosyl, butoxydocosyl, butoxytricosyl, butoxytetracosyl, butoxypentacosyl, butoxyhexacosyl, butoxyheptacosyl, butoxyoctacosyl, butoxynonacosyl, butoxytriacontyl, dimethylaminopropyl, dimethylaminobutyl, dimethylaminopentyl, dimethylaminohexyl, dimethylaminoheptyl, dimethylaminooctyl, dimethylaminononyl, dimethylaminodecyl, dimethylaminoundecyl, dimethylaminododecyl, dimethylaminotridecyl, dimethylaminotetradecyl, dimethylaminopentadecyl, dimethylaminohexadecyl, dimethylaminoheptadecyl, dimethylaminooctadecyl, dimethylaminononadecyl, dimethylaminoeicosyl, dimethylaminoheneicosyl, dimethylaminodocosyl, dimethylaminotricosyl, dimethylaminotetracosyl, dimethylaminopentacosyl, dimethylaminohexacosyl, dimethylaminoheptacosyl, dimethylaminooctacosyl, dimethylaminononacosyl, dimethylaminotriacontyl, trimethylsilylpropyl, trimethylsilylbutyl, trimethylsilylpentyl, trimethylsilylhexyl, trimethylsilylheptyl, trimethylsilyloctyl, trimethylsilylnonyl, trimethylsilyldecyl, trimethylsilylundecyl, trimethylsilyldodecyl, trimethylsilyltridecyl, trimethylsilyltetradecyl, trimethylsilylpentadecyl, trimethylsilylhexadecyl, trimethylsilylheptadecyl, trimethylsilyloctadecyl, trimethylsilylnonadecyl, trimethylsilyleicosyl, trimethylsilylheneicosyl, trimethylsilyldocosyl, trimethylsilyltricosyl, trimethylsilyltetracosyl, trimethylsilylpentacosyl, trimethylsilylhexacosyl, trimethylsilylheptacosyl, trimethylsilyloctacosyl, trimethylsilylnonacosyl, trimethylsilyltriacontyl, phenyl, methylphenyl, dimethylphenyl, trimethylphenyl, tetramethylphenyl, pentamethylphenyl ethylphenyl, diethylphenyl, triethylphenyl, tetraethylphenyl, pentaethylphenyl, propylphenyl, dipropylphenyl, tripropylphenyl, tetrapropylphenyl, pentapropylphenyl butylphenyl, dibutylphenyl, tributylphenyl, tetrabutylphenyl, pentabutylphenyl, hexylphenyl, dihexylphenyl, trihexylphenyl, tetrahexylphenyl, pentahexylphenyl, dimethylethylphenyl, dimethylpropylphenyl, dimethylbutylphenyl, dimethylpentylphenyl, dimethylhexylphenyl, diethylmethylphenyl, diethylpropylphenyl, diethylbutylphenyl, diethylpentylphenyl, diethylhexylphenyl, dipropylmethylphenyl, dipropylethylphenyl, dipropylbutylphenyl, dipropylpentylphenyl, dipropylhexylphenyl, dibutylmethylphenyl, dibutylethylphenyl, dibutylpropylphenyl, dibutylpentylphenyl, dibutylhexylphenyl, methylethylphenyl, methylpropylphenyl, methylbutylphenyl, methylpentylphenyl, methylhexylphenyl, ethylpropylphenyl, ethylbutylphenyl, ethylpentylphenyl, ethylhexylphenyl, propylbutylphenyl, propylpentylphenyl, propylhexylphenyl, butylpentylphenyl, butylhexylphenyl, trimethylsilylphenyl, trimethylgermylphenyl, trifluoromethylphenyl, bis(triflouromethyl)phenyl, halophenyl, dihalophenyl, trihalophenyl, tetrahalophenyl, pentahalophenyl; halomethylphenyl, dihalomethylphenyl, trihalomethylphenyl, tetrahalomethylphenyl, haloethlyphenyl, dihaloethylphenyl, trihaloethylphenyl, tetrahaloethylphenyl, halopropylphenyl, dihalopropylphenyl, trihalopropylphenyl, tetrahalopropylphenyl, halobutylphenyl, dihalobutylphenyl, trihalobutylphenyl, tetrahalobutylphenyl, dihalodimethylphenyl, dihalo(trifluoromethyl)phenyl (where halo is, independently, fluoro, chloro, bromo and iodo), benzyl, methylbenzyl, dimethylbenzyl, trimethylbenzyl, tetramethylbenzyl, pentarnethylbenzyl ethylbenzyl, diethylbenzyl, triethylbenzyl, tetraethylbenzyl, pentaethylbenzyl, propylbenzyl, dipropylbenzyl, tripropylbenzyl, tetrapropylbenzyl, pentapropylbenzyl butylbenzyl, dibutylbenzyl, tributylbenzyl, tetrabutylbenzyl, pentabutylbenzyl, hexylbenzyl, dihexylbenzyl, trihexylbenzyl, tetrahexylbenzyl, pentahexylbenzyl, dimethylethylbenzyl, dimethylpropylbenzyl, dimethylbutylbenzyl, dimethylpentylbenzyl, dimethylhexylbenzyl, diethylmethylbenzyl, diethylpropylbenzyl, diethylbutylbenzyl, diethylpentylbenzyl, diethylhexylbenzyl, dipropylmethylbenzyl, dipropylethylbenzyl, dipropylbutylbenzyl, dipropylpentylbenzyl, dipropylhexylbenzyl, dibutylmethylbenzyl, dibutylethylbenzyl, dibutylpropylbenzyl, dibutylpentylbenzyl, dibutylhexylbenzyl, methylethylbenzyl, methylpropylbenzyl, methylbutylbenzyl, methylpentylbenzyl, methylhexylbenzyl, ethylpropylbenzyl, ethylbutylbenzyl, ethylpentylbenzyl, ethylhexylbenzyl, propylbutylbenzyl, propylpentylbenzyl, propylhexylbenzyl, butylpentylbenzyl, butylhexylbenzyl, trimethylsilylbenzyl, bis(trimethylsilyl)benzyl, trimethylgermylbenzyl, diphenylmethyl, trimethylsilyl, trimethylgermyl, trimethylstannyl, trimethylplumbyl, triethylsilyl, triethylgermyl, dimethylethylsilyl, dimethylethylgermyl, diethylmethylsilyl, diethylmethylgermyl, triphenylsilyl, triphenylgermyl, tripropylsilyl, tripropylgermyl, tributylsilyl, tributylgermyl, tris(trifluormethyl)silyl, bis(perfluoromethyl)methylsilyl, pyrenyl, aceanthrylenyl, acenaphthylene, acephenanthrylenyl, azulenyl biphenylenyl, chrysenyl, coronenyl, fluoranthenyl, fluorenyl, heptacenyl, heptalenyl, heptaphenyl, hexacenyl, hexaphenyl, as-indacenyl, s-indecenyl, indenyl, ovalenyl, pentacenyl, pentalenyl, pentaphenyl, perylenyl, phenalenyl, phenanthrenyl, picenyl, pleiadenyl, pyranhrenyl, rubicenyl, naphthacenyl, tetraphenylenyl, trinaphthylenyl, triphenylenyl, hexahelicenyl, naphthyl, anthracenyl, dibenza[a,b]anthracenyl, indanyl, acenaphthenyl, cholanthrenyl, aceanthrenyl, acephenanthrenyl, 1,2,3,4-tetrahydronapthalene, fullerenyl, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cyclohexenyl, cycloheptyl, cyclooctyl, cyclononyl, cyclodecyl, cycloundecyl, and cyclododecyl, dimethylcyclohexyl, norbornyl, norbornenyl, adamantyl, cubanyl, prismanyl, spiro[4,5]decanyl, biphenyl, bicyclopentyl, terphenyl, quatercyclohexanyl, binaphthyl, binorbornyl, phenyl-terphenyl, 1,1-diphenylmethano, 1,1-dinapthyletheno, acridarsinyl, acridinyl, acridophosphinyl, 1H-acrindolinyl, anthrazinyl, anthyridinyl, arsanthridinyl, arsindolyl, arsindolizinyl, arsinolinyl, arsinolizinyl, benzofuranyl, carbazolyl, β-carbolinyl, chromenyl, thiochromenyl, cinnolinyl, furanyl, imidazolyl, indazolyl, indolyl, indolizinyl, isoarsindolyl, isoarsinolinyl, isobenzofuranyl, isochromenyl, isothiochromenyl, isoindolyl, isophosphindolyl, isophosphinolinyl, isoquinolinyl, isothiazolyl, isoxazolyl, naphthyridinyl, oxazolyl, perimidinyl, phenanthrazinyl, phenanthridinyl, phenanthrolinyl, phenazinyl, phosphanthridinyl, phosphindolyl, phosphindolizinyl, phosphinolizinyl, phthalazinyl, pteridinyl, phthaloperinyl, purinyl, pyranyl, thiopyranal, pyrazinyl, pyrazolyl, pyridazinyl, pyridinyl, pyrindinyl, pyrimidinyl, pyrrolyl, pyrrolizinyl, quinazolinyl, quindolinyl, 1H-quinindolinyl, quinolinyl, quinolizinyl, quinoxalinyl, selenophenyl, thebenidinyl, thiazolyl, thiophenyl, triphenodioxazinyl, triphenodithiazinyl, xanthenyl, chromanyl, thiochromanyl, imidazolidinyl, indolinyl, isochromanyl, isothiochromanyl, isoindolinyl, morpholinyl, piperazinyl, piperidinyl, pyrozolidinyl, pyrrolidinyl, quinuclidinyl, dimethylacridarsinyl, dimethylacridinyl, dimethylacridophosphinyl, dimethyl-1H-acrindolinyl, dimethylanthrazinyl, dimethylanthyridinyl, dimethylarsanthridinyl, dimethylarsindolyl, dimethylarsindolizinyl, dimethylarsinolinyl, dimethylarsinolizinyl, dibutylbenzofuranyl, dibutylcarbazolyl, dibutyl-,-carbolinyl, dibutylchromenyl, dibutylthiochromenyl, butylcinnolinyl, dibutylfuranyl, dimethylimidazolyl, dimethylindazolyl, dipropylindolyl, dipropylindolizinyl, dimethylisoarsindolyl, methylisoarsinolinyl, dimethylisobenzofuranyl, diphenylisochromenyl, dibutylisothiochromenyl, phenylisoindolyl, butylisophosphindolyl, dibutylisophosphinolinyl, dimethylisoquinolinyl, methylisothiazolyl, butylisoxazolyl, butylnaphthyridinyl, dimethyloxazolyl, methylphenylperimidinyl, tetrabutylphenanthrazinyl, propylphenanthridinyl, dibutylphenanthrolinyl, tetramethylphenazinyl, butylphosphanthridinyl, phenylphosphindolyl, dimethylphosphindolizinyl, methylphosphinolizinyl, dibutylphthalazinyl, trimethylpteridinyl, methylphthaloperinyl, dimethylpurinyl, dibutylpyranyl, dibutylthiopyranal, trimethylpyrazinyl, phenylpyrazolyl, dipropylpyridazinyl, dimethylpyridinyl, methylpropylpyrindinyl, triethylpyrimidinyl, dibutylpyrrolyl, diethylpyrrolizinyl, dibutylquinazolinyl, dibutylquindolinyl, dibutyl-1H-quinindolinyl, dimethylquinolinyl, propylquinolizinyl, methylquinoxalinyl, methylbutylselenophenyl, methylthebenidinyl, dimethylthiazolyl, trimethylthiophenyl, dibutyltriphenodioxazinyl, dibutyltriphenodithiazinyl, dibutylxanthenyl, trimethylchromanyl, dimethylthiochromanyl, dimethylimidazolidinyl, dimethylindolinyl, dibutylisochromanyl, dibutylisothiochromanyl, phenylisoindolinyl, dibutylmorpholinyl, dimethylpiperazinyl, dimethylpiperidinyl, dimethylpyrozolidinyl, dimethylpyrrolidinyl, bipyridyl, pyrido[2,1,6-de]quinolizinyl, hexarnethylquinuclidinyl, 5,7-dioxa-6-phosphadibenzo[a,c]cycloheptene-6-oxide, 9-oxa-10-phosphaphenanthrene-10-oxide, methoxy, ethoxy, propoxy, butoxy, pentoxy, phenoxy, dimethylphenoxy, dimethylamino, diethylamino, dipropylamino, methylethylamino, methylpropylamino, ethylpropylamino, diphenylamino, methylphenylamino, and ethylphenylamino.
 13. The compound of claim 11 where at least one R¹¹ and/or at least one R¹² are independently methyl, ethyl, n-propyl, iso-propyl, n-butyl, sec-butyl, iso-butyl, tert-butyl, phenyl, napthyl, diphenylmethyl, or trifluoromethyl.
 14. The compound of claim any of the above claims wherein X is represented by the formulae:

where each O is bonded to M, and where R^(a), R^(b), R^(c) and R^(d) are, independently, selected from the group consisting of hydrogen, methyl, ethyl, ethenyl, ethynyl, and all isomers of propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, nonadecyl, eicosyl, heneicosyl, docosyl, tricosyl, tetracosyl, pentacosyl, hexacosyl, heptacosyl, octacosyl, nonacosyl, triacontyl, propenyl, butenyl, pentenyl, hexenyl, heptenyl, octenyl, nonenyl, decenyl, undecenyl, dodecenyl, tridecenyl, tetradecenyl, pentadecenyl, hexadecenyl, heptadecenyl, octadecenyl, nonadecenyl, eicosenyl, heneicosenyl, docosenyl, tricosenyl, tetracosenyl, pentacosenyl, hexacosenyl, heptacosenyl, octacosenyl, nonacosenyl, triacontenyl, propynyl, butynyl, pentynyl, hexynyl, heptynyl, octynyl, nonynyl, decynyl, undecynyl, dodecynyl, tridecynyl, tetradecynyl, pentadecynyl, hexadecynyl, heptadecynyl, octadecynyl, nonadecynyl, eicosynyl, heneicosynyl, docosynyl, tricosynyl, tetracosynyl, pentacosynyl, hexacosynyl, heptacosynyl, octacosynyl, nonacosynyl, and triacontynyl, phenyl, napthyl, anthracenyl, pyrenyl, biphenyl, benzyl, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, cyclononyl, cyclodecyl, cycloundecyl, cyclododecyl, fluoro, chloro, bromo, iodo, trimethylsilyl, triethylsilyl, tripropylsilyl, dimethylethylsilyl, diethylmethylsilyl, trimethoxysilyl, tirethoxysilyl, tripropoxysilyl, methoxy, ethoxy, propoxy, butoxy, phenoxy, or a nitro, carboxylic acid, ester, ketone (excluding 1,2-diketones) or aldehyde group; and optionally, R^(a), R^(b), R^(c) or R^(d) can connect to form substituted or unsubstituted, saturated, partially unsaturated or aromatic ring structures.
 15. The compound of claim 1 where the transition metal compound is [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butylcatecholate], [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-chlorocatecholate], [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4,5-dichlorocatecholate], [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-fluorocatecholate], [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4,5-difluorocatecholate], [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-methoxycatecholate], [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4,5-dimethoxycatecholate], [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-iso-propylcatecholate], [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-cyclohexylcatecholate], [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,5-di-tert-butylcatecholate], [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,5-di-tert-butyl-6-chlorocatecholate], [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,5-di-tert-butyl-6-nitrocatecholate], [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,4,6-tri-iso-propylcatecholate], [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-iso-propylcatecholate], [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,5-dimethylcatecholate], [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [1,4,6,8-tetra-tert-butyldibenzo[1,4]dioxine-2,3-diolate], [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene) nickel(II) [1,4,6,7,8,9-hexachlorodibenzo[1,4]dioxine-2,3-diolate], [1,4-bis-(2,6-di-iso-propylphenyl)-1,4-dia-1,3-butadiene]nickel(II) [1,4,6,7,8,9-hexabromodibenzo[1,4]dioxine-2,3-diolate], [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butylcatecholate], [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-chlorocatecholate], [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4,5-dichlorocatecholate], [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-fluorocatecholate], [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4,5-difluorocatecholate], [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-methoxycatecholate], [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4,5-dimethoxycatecholate], [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-iso-propylcatecholate], [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-cyclohexylcatecholate], [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,5-di-tert-butylcatecholate], [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-I ,4-diaza-1,3-butadiene) nickel(II) [3,5-di-tert-butyl-6-chlorocatecholate], [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,5-di-tert-butyl-6-nitrocatecholate], [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,4,6-tri-iso-propylcatecholate], [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-iso-propylcatecholate], [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [1,4,6,8-tetra-tert-butyldibenzo[1,4]dioxine-2,3-diolate], [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [1,4,6,7,8,9-hexachlorodibenzo [1,4]dioxine-2,3-diolate], [2,3-dimethyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [1,4,6,7,8,9-hexabromodibenzo[1,4]dioxine-2,3-diolate], [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butylcatecholate], [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-chlorocatecholate), [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4,5-dichlorocatecholate], [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-fluorocatecholate], [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4,5-difluorocatecholate], [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-methoxycatecholate], [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4,5-dimethoxycatecholate), [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-iso-propylcatecholate], [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene) nickel(II) [3,6-di-tert-butyl-4-cyclohexylcatecholate], [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,5-di-tert-butylcatecholate], [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,5-di-tert-butyl-6-chlorocatecholate], [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,5-di-tert-butyl-6-nitrocatecholate), [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,4,6-tri-iso-propylcatecholate], [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-iso-propylcatecholate], [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [1,4,6,8-tetra-tert-butyldibenzo[1,4]dioxine-2,3-diolate], [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [1,4,6,7,8,9-hexachlorodibenzo[1,4]dioxine-2,3-diolate), [2-methyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [1,4,6,7,8,9-hexabromodibenzo[1,4]dioxine-2,3-diolate], [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diza-1,3-butadiene]nickel(II) [3,6-di-tert-butylcatecholate], [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-chlorocatecholate], [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4,5-dichlorocatecholate], [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-fluorocatecholate], [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4,5-difluorocatecholate], [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-methoxycatecholate], [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4,5-dimethoxycatecholate), [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-iso-propylcatecholate], [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-cyclohexylcatecholate], [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,5-di-tert-butylcatecholate], [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,5-di-tert-butyl-6-chlorocatecholate], [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,5-di-tert-butyl-6-nitrocatecholate], [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,4,6-tri-iso-propylcatecholate], [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-iso-propylcatecholate], [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [1,4,6,8-tetra-tert-butyldibenzo [1,4]dioxine-2,3-diolate], [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [1,4,6,7,8,9-hexachlorodibenzo[1,4]dioxine-2,3-diolate], [2-methyl-3-propyl-1,4-bis-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [1,4,6,7,8,9-hexabromodibenzo[1,4]dioxine-2,3-diolate], [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II) [3,6-di-tert-butylcatecholate], [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II) [3,6-di-tert-butyl-4-chlorocatecholate], [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II) [3,6-di-tert-butyl-4,5-dichlorocatecholate], [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II) [3,6-di-tert-butyl-4-fluorocatecholate], [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II) [3,6-di-tert-butyl-4,5-difluorocatecholate], [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II) [3,6-di-tert-butyl-4-methoxycatecholate], [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II) [3,6-di-tert-butyl-4,5-dimethoxycatecholate], [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II) [3,6-di-tert-butyl-4-iso-propylcatecholate], [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II) [3,6-di-tert-butyl-4-cyclohexylcatecholate], [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II) [3,5-di-tert-butylcatecholate], [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II) [3,5-di-tert-butyl-6-chlorocatecholate), [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II) [3,5-di-tert-butyl-6-nitrocatecholate], [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II) [3,4,6-tri-iso-propylcatecholate], [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II) [3,6-di-iso-propylcatecholate], [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II) [1,4,6,8-tetra-tert-butyldibenzo[1,4]dioxine-2,3-diolate], [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II) [1,4,6,7,8,9-hexachlorodibenzo[1,4]dioxine-2,3-diolate), [1,2-bis-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II) [1,4,6,7,8,9-hexabromodibenzo[1,4]dioxine-2,3-diolate), [1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butylcatecholate], [1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-chlorocatecholate], [1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4,5-dichlorocatecholate], [1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-fluorocatecholate], [1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4,5-difluorocatecholate], [1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-methoxycatecholate], [1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4,5-dimethoxycatecholate], [1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-iso-propylcatecholate], [1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-cyclohexylcatecholate], [1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,5-di-tert-butylcatecholate], [1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,5-di-tert-butyl-6-chlorocatecholate], [1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,5-di-tert-butyl-6-nitrocatecholate], [1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,4,6-tri-iso-propylcatecholate], [1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-iso-propylcatecholate], [1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,5-dimethylcatecholate], [1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [1,4,6,8-tetra-tert-butyldibenzo[1,4]dioxine-2,3-diolate], [1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [1,4,6,7,8,9-hexachlorodibenzo[1,4]dioxine-2,3-diolate], [1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [1,4,6,7,8,9-hexabromodibenzo[1,4]dioxine-2,3-diolate], [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butylcatecholate], [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-chlorocatecholate], [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4,5-dichlorocatecholate], [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-fluorocatecholate], [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4,5-difluorocatecholate], [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-methoxycatecholate], [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4,5-dimethoxycatecholate], [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-iso-propylcatecholate], [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-cyclohexylcatecholate], [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,5-di-tert-butylcatecholate], [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,5-di-tert-butyl-6-chlorocatecholate], [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,5-di-tert-butyl-6-nitrocatecholate], [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,4,6-tri-iso-propylcatecholate], [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-iso-propylcatecholate], [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [1,4,6,8-tetra-tert-butyldibenzo[1,4]dioxine-2,3-diolate], [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [1,4,6,7,8,9-hexachlorodibenzo [1,4]dioxine-2,3-diolate], [2,3-dimethyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [1,4,6,7,8,9-hexabromodibenzo[1,4]dioxine-2,3-diolate], [2-methyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butylcatecholate], [2-methyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-chlorocatecholate], [2-methyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4,5-dichlorocatecholate], [2-methyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-fluorocatecholate], [2-methyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4,5-difluorocatecholate], [2-methyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-methoxycatecholate], [2-methyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4,5-dimethoxycatecholate], [2-methyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-iso-propylcatecholate], [2-methyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl4-cyclohexylcatecholate], [2-methyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,5-di-tert-butylcatecholate], [2-methyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,5-di-tert-butyl-6-chlorocatecholate], [2-methyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,5-di-tert-butyl-6-nitrocatecholate], [2-methyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,4,6-tri-iso-propylcatecholate], [2-methyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-iso-propylcatecholate], [2-methyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [1,4,6,8-tetra-tert-butyldibenzo[1,4]dioxine-2,3-diolate], [2-methyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [1,4,6,7,8,9-hexachlorodibenzo[1,4]dioxine-2,3-diolate], [2-methyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [1,4,6,7,8,9-hexabromodibenzo[1,4]dioxine-2,3-diolate], [2-methyl-3-propyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butylcatecholate], [2-methyl-3-propyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-chlorocatecholate], [2-methyl-3-propyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4,5-dichlorocatecholate], [2-methyl-3-propyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-fluorocatecholate], [2-methyl-3-propyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4,5-difluorocatecholate], [2-methyl-3-propyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-methoxycatecholate], [2-methyl-3-propyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4,5-dimethoxycatecholate], [2-methyl-3-propyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-iso-propylcatecholate], [2-methyl-3-propyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-cyclohexylcatecholate], [2-methyl-3-propyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,5-di-tert-butylcatecholate], [2-methyl-3-propyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene) nickel(II) [3,5-di-tert-butyl-6-chlorocatecholate], [2-methyl-3-propyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,5-di-tert-butyl-6-nitrocatecholate], [2-methyl-3-propyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,4,6-tri-iso-propylcatecholate], [2-methyl-3-propyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-iso-propylcatecholate], [2-methyl-3-propyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [1,4,6,8-tetra-tert-butyldibenzo[1,4]dioxine-2,3-diolate], [2-methyl-3-propyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [1,4,6,7,8,9-hexachlorodibenzo[1,4]dioxine-2,3-diolate], [2-methyl-3-propyl-1,4-bis-(2,6-dimethylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [1,4,6,7,8,9-hexabromodibenzo[1,4]dioxine-2,3-diolate], [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II) [3,6-di-tert-butylcatecholate], [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II) [3,6-di-tert-butyl-4-chlorocatecholate], [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II) [3,6-di-tert-butyl-4,5-dichlorocatecholate], [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II) [3,6-di-tert-butyl-4-fluorocatecholate], [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II) [3,6-di-tert-butyl-4,5-difluorocatecholate], [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II) [3,6-di-tert-butyl-4-methoxycatecholate], [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II) [3,6-di-tert-butyl-4,5-dimethoxycatecholate], [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II) [3,6-di-tert-butyl-4-iso-propylcatecholate], [1,2-bis-(2,6-dimethylphenylimino)acenaphthene) nickel(II) [3,6-di-tert-butyl-4-cyclohexylcatecholate], [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II) [3,5-di-tert-butylcatecholate], [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II) [3,5-di-tert-butyl-6-chlorocatecholate], [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II) [3,5-di-tert-butyl-6-nitrocatecholate], [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II) [3,4,6-tri-iso-propylcatecholate], [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II) [3,6-di-iso-propylcatecholate], [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II) [1,4,6,8-tetra-tert-butyldibenzo[1,4]dioxine-2,3-diolate], [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II) [1,4,6,7,8,9-hexachlorodibenzo[1,4]dioxine-2,3-diolate], [1,2-bis-(2,6-dimethylphenylimino)acenaphthene]nickel(II) [1,4,6,7,8,9-hexabromodibenzo[1,4]dioxine-2,3-diolate], [1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butylcatecholate], [1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-chlorocatecholate], [1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4,5-dichlorocatecholate], [1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-fluorocatecholate], [1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4,5-difluorocatecholate], [1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-methoxycatecholate), [1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4,5-dimethoxycatecholate], [1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene nickel(II) [3,6-di-tert-butyl-4-iso-propylcatecholate], [1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-cyclohexylcatecholate], [1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,5-di-tert-butylcatecholate], [1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,5-di-tert-butyl-6-chlorocatecholate], [1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,5-di-tert-butyl-6-nitrocatecholate], [1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,4,6-tri-iso-propylcatecholate], [1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-iso-propylcatecholate], [1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,5-dimethylcatecholate], [1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(I1) [1,4,6,8-tetra-tert-butyldibenzo[1,4]dioxine-2,3-diolate], [1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [1,4,6,7,8,9-hexachlorodibenzo[1,4]dioxine-2,3-diolate], [1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [1,4,6,7,8,9-hexabromodibenzo[1,4]dioxine-2,3-diolate], [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butylcatecholate], [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-chlorocatecholate], [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4,5-dichlorocatecholate], [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-fluorocatecholate], [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4,5-difluorocatecholate], [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-methoxycatecholate], [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4,5-dimethoxycatecholate], [2,3-dimethyl-1-(2,6-diethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-iso-propylcatecholate], [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-cyclohexylcatecholate], [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,5-di-tert-butylcatecholate], [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,5-di-tert-butyl-6-chlorocatecholate], [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,5-di-tert-butyl-6-nitrocatecholate], [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,4,6-tri-iso-propylcatecholate], [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-iso-propylcatecholate], [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [1,4,6,8-tetra-tert-butyldibenzo[1,4]dioxine-2,3-diolate], [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [1,4,6,7,8,9-hexachlorodibenzo[1,4]dioxine-2,3-diolate], [2,3-dimethyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [1,4,6,7,8,9-hexabromodibenzo[1,4]dioxine-2,3-diolate], [2-methyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butylcatecholate], [2-methyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-chlorocatecholate], [2-methyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4,5-dichlorocatecholate], [2-methyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-fluorocatecholate], [2-methyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4,5-difluorocatecholate], [2-methyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-methoxycatecholate], [2-methyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4,5-dimethoxycatecholate], [2-methyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-iso-propylcatecholate], [2-methyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-cyclohexylcatecholate], [2-methyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,5-di-tert-butylcatecholate], [2-methyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,5-di-tert-butyl-6-chlorocatecholate], [2-methyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,5-di-tert-butyl-6-nitrocatecholate], [2-methyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,4,6-tri-iso-propylcatecholate], [2-methyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-iso-propylcatecholate], [2-methyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [1,4,6,8-tetra-tert-butyldibenzo[1,4]dioxine-2,3-diolate], [2-methyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [1,4,6,7,8,9-hexachlorodibenzo[1,4]dioxine-2,3-diolate], [2-methyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [1,4,6,7,8,9-hexabromodibenzo[1,4]dioxine-2,3-diolate], [2-methyl-3-propyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butylcatecholate], [2-methyl-3-propyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-chlorocatecholate], [2-methyl-3-propyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4,5-dichlorocatecholate], [2-methyl-3-propyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-fluorocatecholate], [2-methyl-3-propyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4,5-difluorocatecholate], [2-methyl-3-propyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-methoxycatecholate], [2-methyl-3-propyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4,5-dimethoxycatecholate], [2-methyl-3-propyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-iso-propylcatecholate], [2-methyl-3-propyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-cyclohexylcatecholate], [2-methyl-3-propyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,5-di-tert-butylcatecholate], [2-methyl-3-propyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,5-di-tert-butyl-6-chlorocatecholate], [2-methyl-3-propyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,5-di-tert-butyl-6-nitrocatecholate], [2-methyl-3-propyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,4,6-tri-iso-propylcatecholate), [2-methyl-3-propyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-iso-propylcatecholate], [2-methyl-3-propyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [1,4,6,8-tetra-tert-butyldibenzo[1,4]dioxine-2,3-diolate], [2-methyl-3-propyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [1,4,6,7,8,9-hexachlorodibenzo[1,4]dioxine-2,3-diolate], [2-methyl-3-propyl-1-(2,6-dimethylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [1,4,6,7,8,9-hexabromodibenzo[1,4]dioxine-2,3-diolate], [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II) [3,6-di-tert-butylcatecholate], [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II) [3,6-di-tert-butyl-4-chlorocatecholate], [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II) [3,6-di-tert-butyl-4,5-dichlorocatecholate), [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene nickel(II) [3,6-di-tert-butyl-4-fluorocatecholate], [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II) [3,6-di-tert-butyl-4,5-difluorocatecholate], [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II) [3,6-di-tert-butyl-4-methoxycatecholate], [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II) [3,6-di-tert-butyl-4,5-dimethoxycatecholate], [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II) [3,6-di-tert-butyl-4-iso-propylcatecholate], [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II) [3,6-di-tert-butyl-4-cyclohexylcatecholate], [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II) [3,5-di-tert-butylcatecholate], [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II) [3,5-di-tert-butyl-6-chlorocatecholate], [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II) [3,5-di-tert-butyl-6-nitrocatecholate], [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II) [3,4,6-tri-iso-propylcatecholate], [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II) [3,6-di-iso-propylcatecholate], [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II) [1,4,6,8-tetra-tert-butyldibenzo [1,4]dioxine-2,3-diolate], [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II) [1,4,6,7,8,9-hexachlorodibenzo[1,4]dioxine-2,3-diolate], [1-(2,6-dimethylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II) [1,4,6,7,8,9-hexabromodibenzo[1,4]dioxine-2,3-diolate], [1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butylcatecholate], [1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-chlorocatecholate], [1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4,5-dichlorocatecholate], [1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-fluorocatecholate], [1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4,5-difluorocatecholate], [1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-methoxycatecholate], [1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4,5-dimethoxycatecholate], [1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-iso-propylcatecholate], [1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-cyclohexylcatecholate], [1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-,4-diaza-1,3-butadiene]nickel(II) [3,5-di-tert-butylcatecholate], [1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-,4-diaza-1,3-butadiene]nickel(II) [3,5-di-tert-butyl-6-chlorocatecholate], [1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,5-di-tert-butyl-6-nitrocatecholate], [1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,4,6-tri-iso-propylcatecholate], [1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-iso-propylcatecholate], [1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,5-dimethylcatecholate], [1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [1,4,6,8-tetra-tert-butyldibenzo[1,4]dioxine-2,3-diolate], [1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [1,4,6,7,8,9-hexachlorodibenzo[1,4]dioxine-2,3-diolate], [1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-,4-diaza-1,3-butadiene]nickel(II) [1,4,6,7,8,9-hexabromodibenzo[1,4]dioxine-2,3-diolate], [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butylcatecholate], [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-chlorocatecholate], [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4,5-dichlorocatecholate], [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-bromocatecholate], [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4,5-dibromocatecholate], [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-fluorocatecholate], [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4,5-difluorocatecholate], [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-methoxycatecholate], [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4,5-dimethoxycatecholate], [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-iso-propylcatecholate], [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-cyclohexylcatecholate], [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,5-di-tert-butylcatecholate], [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,5-di-tert-butyl-6-chlorocatecholate], [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,5-di-tert-butyl-6-nitrocatecholate], [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,4,6-tri-iso-propylcatecholate], [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-iso-propylcatecholate], [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [1,4,6,8-tetra-tert-butyldibenzo[1,4]dioxine-2,3-diolate], [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [1,4,6,7,8,9-hexachlorodibenzo[1,4]dioxine-2,3-diolate], [2,3-dimethyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di -iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [1,4,6,7,8,9-hexabromodibenzo[1,4]dioxine-2,3-diolate], [2-methyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butylcatecholate], [2-methyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-chlorocatecholate], [2-methyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4,5-dichlorocatecholate], [2-methyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-fluorocatecholate], [2-methyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4,5-difluorocatecholate], [2-methyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-methoxycatecholate], [2-methyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4,5-dimethoxycatecholate], [2-methyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-iso-propylcatecholate], [2-methyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-cyclohexylcatecholate], [2-methyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,5-di-tert-butylcatecholate], [2-methyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,5-di-tert-butyl-6-chlorocatecholate], [2-methyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,5-di-tert-butyl-6-nitrocatecholate], [2-methyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,4,6-tri-iso-propylcatecholate], [2-methyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-iso-propylcatecholate], [2-methyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [1,4,6,8-tetra-tert-butyldibenzo[1,4]dioxine-2,3-diolate], [2-methyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [1,4,6,7,8,9-hexachlorodibenzo[1,4]dioxine-2,3-diolate], [2-methyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [1,4,6,7,8,9-hexabromodibenzo[1,4]dioxine-2,3-diolate], [2-methyl-3-propyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butylcatecholate], [2-methyl-3-propyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-chlorocatecholate], [2-methyl-3-propyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4,5-dichlorocatecholate], [2-methyl-3-propyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-fluorocatecholate], [2-methyl-3-propyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4,5-difluorocatecholate], [2-methyl-3-propyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-methoxycatecholate], [2-methyl-3-propyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4,5-dimethoxycatecholate], [2-methyl-3-propyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-iso-propylcatecholate], [2-methyl-3-propyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-tert-butyl-4-cyclohexylcatecholate], [2-methyl-3-propyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,5-di-tert-butylcatecholate], [2-methyl-3-propyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,5-di-tert-butyl-6-chlorocatecholate], [2-methyl-3-propyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,5-di-tert-butyl-6-nitrocatecholate], [2-methyl-3-propyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,4,6-tri-iso-propylcatecholate], [2-methyl-3-propyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [3,6-di-iso-propylcatecholate], [2-methyl-3-propyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [1,4,6,8-tetra-tert-butyldibenzo[1,4]dioxine-2,3-diolate], [2-methyl-3-propyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [1,4,6,7,8,9-hexachlorodibenzo[1,4]dioxine-2,3-diolate], [2-methyl-3-propyl-1-(2,5-di-tert-butylphenyl)-4-(2,6-di-iso-propylphenyl)-1,4-diaza-1,3-butadiene]nickel(II) [1,4,6,7,8,9-hexabromodibenzo[1,4]dioxine-2,3-diolate], [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II) [3,6-di-tert-butylcatecholate], [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II) [3,6-di-tert-butyl-4-chlorocatecholate], [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II) [3,6-di-tert-butyl-4,5-dichlorocatecholate], [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II) [3,6-di-tert-butyl-4-fluorocatecholate], [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II) [3,6-di-tert-butyl-4,5-difluorocatecholate], [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II) [3,6-di-tert-butyl-4-methoxycatecholate], [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II) [3,6-di-tert-butyl-4,5-dimethoxycatecholate], [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II) [3,6-di-tert-butyl-4-iso-propylcatecholate), [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II) [3,6-di-tert-butyl-4-cyclohexylcatecholate], [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II) [3,5-di-tert-butylcatecholate], [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II) [3,5-di-tert-butyl-6-chlorocatecholate], [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II) [3,5-di-tert-butyl-6-nitrocatecholate], [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II) [3,4,6-tri-iso-propylcatecholate], [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II) [3,6-di-iso-propylcatecholate), [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II) [1,4,6,8-tetra-tert-butyldibenzo[1,4]dioxine-2,3-diolate], [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II) [1,4,6,7,8,9-hexachlorodibenzo[1,4]dioxine-2,3-diolate], [1-(2,5-di-tert-butylphenylimino)-2-(2,6-di-iso-propylphenylimino)acenaphthene]nickel(II) [1,4,6,7,8,9-hexabromodibenzo[1,4]dioxine-2,3-diolate], [1,2-bis-(2,6-dimethylphenylimino)-cyclohexane]nickel(II) [3,6-di-tert-butylcatecholate], [2,3-bis-(2,6-dimethylphenylimino)-[1,4]dithiane]nickel(II) [3,6-di-tert-butylcatecholate], [2,3-bis-(2,6-dimethylphenylimino)-piperazine]nickel(II) [3,6-di-tert-butylcatecholate], [1,4-dimethyl-2,3-bis-(2,6-dimethylphenylimino)-piperazine]nickel(II) [3,6-di-tert-butylcatecholate], [2,3-bis-(2,6-dimethylphenylimino)-bicyclo[2.2.1]-heptane) nickel(II) [3,6-di-tert-butylcatecholate), [1,4-dimethyl-2,3-bis-(2,6-dimethylphenylimino)-[1,4]diazepane]nickel(II) [3,6-di-tert-butylcatecholate], [1-methyl-2,3-bis-(2,6-dimethylphenylimino)-cyclopentane]nickel(II) [3,6-di-tert-butylcatecholate], [5-methyl-2,3-bis-(2,6-dimethylphenylimino)-tetrahydrofuran]nickel(II) [3,6-di-tert-butylcatecholate), [5-methyl-2,3-bis-(2,6-dimethylphenylimino)-2,3-dihydrohydrofuran]nickel(II) [3,6-di-tert-butylcatecholate], [1,2-bis-(2,6-di-iso-propylphenylimino)-cyclohexane]nickel(II) [3,6-di-tert-butylcatecholate], [2,3-bis-(2,6-di-iso-propylphenylimino)-[1,4]dithiane]nickel(II) [3,6-di-tert-butylcatecholate], [2,3-bis-(2,6-di-iso-propylphenylimino)-piperazine]nickel(II) [3,6-di-tert-butylcatecholate], [1,4-dimethyl-2,3-bis-(2,6-di-iso-propylphenylimino)-piperazine]nickel(II) [3,6-di-tert-butylcatecholate], [2,3-bis-(2,6-di-iso-propylphenylimino)-bicyclo[2.2.1]-heptane]nickel(II) [3,6-di-tert-butylcatecholate], [1,4-dimethyl-2,3-bis-(2,6-di-iso-propylphenylimino)-[1,4]diazepane]nickel(II) [3,6-di-tert-butylcatecholate], [1-methyl-2,3-bis-(2,6-di-iso-propylphenylimino)-cyclopentane]nickel(II) [3,6-di-tert-butylcatecholate], [5-methyl-2,3-bis-(2,6-di-iso-propylphenylimino)-tetrahydrofuran]nickel(II) [3,6-di-tert-butylcatecholate], [5-methyl-2,3-bis-(2,6-di-iso-propylphenylimino)-2,3-dihydrohydrofuran]nickel(II) [3,6-di-tert-butylcatecholate], [1-(2,6-di-iso-propylphenylimino)-2-(2,6-dimethylphenylimino)-cyclohexane]nickel(II) [3,6-di-tert-butylcatecholate], [2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-[1,4]dithiane]nickel(II) [3,6-di-tert-butylcatecholate], [2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-piperazine]nickel(II) [3,6-di-tert-butylcatecholate], [1,4-dimethyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-piperazine]nickel(II) [3,6-di-tert-butylcatecholate], [2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-bicyclo[2.2.1]-heptane]nickel(II) [3,6-di-tert-butylcatecholate], [1,4-dimethyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-[1,4]diazepane]nickel(II) [3,6-di-tert-butylcatecholate], [1-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-cyclopentane]nickel(II) [3,6-di-tert-butylcatecholate], [5-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-tetrahydrofuran]nickel(II) [3,6-di-tert-butylcatecholate], [5-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-2,3-dihydrohydrofuran]nickel(II) [3,6-di-tert-butylcatecholate], [1-(2,6-di-iso-propylphenylimino)-2-(2,5-di-tert-butylphenylimino)-cyclohexane]nickel(II) [3,6-di-tert-butylcatecholate], [2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-[1,4]dithiane]nickel(II) [3,6-di-tert-butylcatecholate], [2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-piperazine]nickel(II) [3,6-di-tert-butylcatecholate], [1,4-dimethyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-piperazine]nickel(II) [3,6-di-tert-butylcatecholate], [2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-bicyclo[2.2.1]-heptane]nickel(II) [3,6-di-tert-butylcatecholate], [1,4-dimethyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-[1,4]diazepane]nickel(II) [3,6-di-tert-butylcatecholate], [1-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-cyclopentane]nickel(II) [3,6-di-tert-butylcatecholate], [5-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-tetrahydrofuran]nickel(II) [3,6-di-tert-butylcatecholate], [5-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-2,3-dihydrohydrofuran]nickel(II) [3,6-di-tert-butylcatecholate], [1,2-bis-(2,6-dimethylphenylimino)-cyclohexane]nickel(II) [3,5-di-tert-butylcatecholate], [2,3-bis-(2,6-dimethylphenylimino)-[1,4]dithiane]nickel(II) [3,5-di-tert-butylcatecholate], [2,3-bis-(2,6-dimethylphenylimino)-piperazine]nickel(II) [3,5-di-tert-butylcatecholate], [1,4-dimethyl-2,3-bis-(2,6-dimethylphenylimino)-piperazine]nickel(II) [3,5-di-tert-butylcatecholate], [2,3-bis-(2,6-dimethylphenylimino)-bicyclo[2.2.1]-heptane]nickel(II) [3,5-di-tert-butylcatecholate], [1,4-dimethyl-2,3-bis-(2,6-dimethylphenylimino)-[1,4]diazepane]nickel(II) [3,5-di-tert-butylcatecholate], [1-methyl-2,3-bis-(2,6-dimethylphenylimino)-cyclopentane]nickel(II) [3,5-di-tert-butylcatecholate], [5-methyl-2,3-bis-(2,6-dimethylphenylimino)-tetrahydrofuran]nickel(II) [3,5-di-tert-butylcatecholate], [5-methyl-2,3-bis-(2,6-dimethylphenylimino)-2,3-dihydrohydrofuran]nickel(II) [3,5-di-tert-butylcatecholate], [1,2-bis-(2,6-di-iso-propylphenylimino)-cyclohexane]nickel(II) [3,5-di-tert-butylcatecholate], [2,3-bis-(2,6-di-iso-propylphenylimino)-[1,4]dithiane]nickel(II) [3,5-di-tert-butylcatecholate], [2,3-bis-(2,6-di-iso-propylphenylimino)-piperazine]nickel(II) [3,5-di-tert-butylcatecholate], [1,4-dimethyl-2,3-bis-(2,6-di-iso-propylphenylimino)-piperazine]nickel(II) [3,5-di-tert-butylcatecholate], [2,3-bis-(2,6-di-iso-propylphenylimino)-bicyclo[2.2.1]-heptane]nickel(II) [3,5-di-tert-butylcatecholate] [1,4-dimethyl-2,3-bis-(2,6-di-iso-propylphenylimino)-[1,4]diazepane]nickel(II) [3,5-di-tert-butylcatecholate], [1-methyl-2,3-bis-(2,6-di-iso-propylphenylimino)-cyclopentane]nickel(II) [3,5-di-tert-butylcatecholate], [5-methyl-2,3-bis-(2,6-di-iso-propylphenylimino)-tetrahydrofuran]nickel(II) [3,5-di-tert-butylcatecholate], [5-methyl-2,3-bis-(2,6-di-iso-propylphenylimino)-2,3-dihydrohydrofuran]nickel(I) [3,5-di-tert-butylcatecholate], [1-(2,6-di-iso-propylphenylimino)-2-(2,6-dimethylphenylimino)-cyclohexane]nickel(II) [3,5-di-tert-butylcatecholate], [2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-[1,4]dithiane]nickel(II) [3,5-di-tert-butylcatecholate], [2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-piperazine]nickel(II) [3,5-di-tert-butylcatecholate], [1,4-dimethyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-piperazine]nickel(II) [3,5-di-tert-butylcatecholate], [2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-bicyclo[2.2.1]-heptane]nickel(II) [3,5-di-tert-butylcatecholate], [1,4-dimethyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-[1,4]diazepane]nickel(II) [3,5-di-tert-butylcatecholate], [1-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-cyclopentane]nickel(II) [3,5-di-tert-butylcatecholate], [5-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-tetrahydrofuran]nickel(II) [3,5-di-tert-butylcatecholate], [5-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,6-dimethylphenylimino)-2,3-dihydrohydrofuran]nickel(II) [3,5-di-tert-butylcatecholate], [1-(2,6-di-iso-propylphenylimino)-2-(2,5-di-tert-butylphenylimino)-cyclohexane]nickel(II) [3,5-di-tert-butylcatecholate], [2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-[1,4]dithiane]nickel(II) [3,5-di-tert-butylcatecholate], [2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-piperazine]nickel(II) [3,5-di-tert-butylcatecholate], [1,4-dimethyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-piperazine]nickel(II) [3,5-di-tert-butylcatecholate], [2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-bicyclo[2.2.1]-heptane]nickel(II) [3,5-di-tert-butylcatecholate], [1,4-dimethyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-[1,4]diazepane]nickel(II) [3,5-di-tert-butylcatecholate], [1-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-cyclopentane]nickel(II) [3,5-di-tert-butylcatecholate], [5-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-tetrahydrofuran]nickel(II) [3,5-di-tert-butylcatecholate], [5-methyl-2-(2,6-di-iso-propylphenylimino)-3-(2,5-di-tert-butylphenylimino)-2,3-dihydrohydrofuran]nickel(II) [3,5-di-tert-butylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4,6-trimethylbenzenamine]cobalt(I) [3,5-di-tert-butylcatecholate), N,N′-(2,6-pyridinediyldiethylidyne)bis[2-methylbenzenamine]cobalt(I) [3,5-di-tert-butyl catecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-dimethylbenzenamine]cobalt(I) [3,5-di-tert-butylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4-dimethylbenzenamine]cobalt(I) [3,5-di-tert-butylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-di-iso-propylbenzenamine]cobalt(I) [3,5-di-tert-butylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-di-iso-propyl-4-methylbenzenamine]cobalt(I) [3,5-di-tert-butylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-4-methylbenzenamine]cobalt(I) [3,5-di-tert-butylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-6-methylbenzenamine]cobalt(I) [3,5-di-tert-butylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-benzenamine]cobalt(I) [3,5-di-tert-butylcatecholate], N,N′-(2,6-pyridinediyldimethylidyne)bis[2,4,6-trimethylbenzenamine]cobalt(I) [3,5-di-tert-butylcatecholate], N,N′-(2,6-pyridinediyldimethylidyne)bis[2-methylbenzenamine]cobalt(I) [3,5-di-tert-butylcatecholate], N,N′-(2,6-pyridinediyldimethylidyne)bis[2,6-dimethylbenzenamine]cobalt(I) [3,5-di-tert-butylcatecholate], N,N′-(2,6-pyridinediyldimethylidyne)bis[2,4-dimethylbenzenamine]cobalt(I) [3,5-di-tert-butylcatecholate], N,N′-(2,6-pyridinediyldimethylidyne)bis[2,6-di-iso-propylbenzenamine]cobalt(I) [3,5-di-tert-butylcatecholate], N,N′-(2,6-pyridinediyldimethylidyne)bis[2,6-di-iso-propyl-4-methylbenzenamine]cobalt(I) [3,5-di-tert-butylcatecholate], N,N′-(2,6-pyridinediyldimethylidyne)bis[2-iso-propyl-4-methylbenzenamine]cobalt(I) [3,5-di-tert-butylcatecholate], N,N′-(2,6-pyridinediyldimethylidyne)bis[2-iso-propyl-6-methylbenzenamine) cobalt(I) [3,5-di-tert-butylcatecholate], N,N′-(2,6-pyridinediyldimethylidyne)bis[2-iso-propylbenzenamine]cobalt(I) [3,5-di-tert-butylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[benzenamine) cobalt(I) [3,5-di-tert-butylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4,6-trimethylbenzenamine]cobalt(I) [3,6-di-tert-butylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2-methylbenzenamine]cobalt(I) [3,6-di-tert-butyl catecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-dimethylbenzenamine]cobalt(I) [3,6-di-tert-butylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4-dimethylbenzenamine]cobalt(I) [3,6-di-tert-butylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-di-iso-propylbenzenamine]cobalt(I) [3,6-di-tert-butylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-di-iso-propyl-4-methylbenzenamine]cobalt(I) [3,6-di-tert-butylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-4-methylbenzenamine]cobalt(I) [3,6-di-tert-butylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-6-methylbenzenamine]cobalt(I) [3,6-di-tert-butylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-benzenamine]cobalt(I) [3,6-di-tert-butylcatecholate], N,N′-(2,6-pyridinediyldimethylidyne)bis[2,4,6-trimethylbenzenamine]cobalt(I) [3,6-di-tert-butylcatecholate], N,N′-(2,6-pyridinediyldimethylidyne)bis[2-methylbenzenamine]cobalt(I) [3,6-di-tert-butylcatecholate), N,N′-(2,6-pyridinediyldimethylidyne)bis[2,6-dimethylbenzenamine]cobalt(I) [3,6-di-tert-butylcatecholate], N,N′-(2,6-pyridinediyldimethylidyne)bis[2,4-dimethylbenzenamine]cobalt(I) [3,6-di-tert-butylcatecholate], N,N′-(2,6-pyridinediyldimethylidyne)bis[2,6-di-iso-propylbenzenamine]cobalt(I) [3,6-di-tert-butylcatecholate], N,N′-(2,6-pyridinediyldimethylidyne)bis[2,6-di-iso-propyl-4-methylbenzenamine]cobalt(I) [3,6-di-tert-butylcatecholate], N,N′-(2,6-pyridinediyldimethylidyne)bis[2-iso-propyl-4-methylbenzenamine]cobalt(I) [3,6-di-tert-butylcatecholate), N,N′-(2,6-pyridinediyldimethylidyne)bis[2-iso-propyl-6-methylbenzenamine) cobalt(I) [3,6-di-tert-butylcatecholate], N,N′-(2,6-pyridinediyldimethylidyne)bis[2-iso-propylbenzenamine]cobalt(I) [3,6-di-tert-butylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[benzenamine]cobalt(I) [3,6-di-tert-butylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4,6-trimethylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4-chlorocatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2-methylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4-chlorocatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-dimethylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4-chlorocatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4-dimethylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4-chlorocatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-di-iso-propylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4-chlorocatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-di-iso-propyl-4-methylbenzenamine cobalt(I) [3,6-di-tert-butyl-4-chlorocatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-4-methylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4-chlorocatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-6-methylbenzenamine) cobalt(I) [3,6-di-tert-butyl-4-chlorocatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-benzenamine]cobalt(I) [3,6-di-tert-butyl-4-chlorocatecholate], N,N′-(2,6-pyridinediyldimethylidyne)bis[2,4,6-trimethylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4-chlorocatecholate], N,N′-(2,6-pyridinediyldimethylidyne)bis[2-methylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4-chlorocatecholate], N,N′-(2,6-pyridinediyldimethylidyne)bis[2,6-dimethylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4-chlorocatecholate], ‘N,N′-(2,6-pyridinediyldimethylidyne)bis[2,4-dimethylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4-chlorocatecholate], N,N′-(2,6-pyridinediyldimethylidyne)bis[2,6-di-iso-propylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4-chlorocatecholate], N,N′-(2, 6-pyridinediyldimethylidyne)bis[2,6-di-iso-propyl-4-methylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4-chlorocatecholate], N,N′-(2,6-pyridinediyldimethylidyne)bis[2-iso-propyl-4-methylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4-chlorocatecholate], N,N′-(2,6-pyridinediyldimethylidyne)bis[2-iso-propyl-6-methylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4-chlorocatecholate], N,N′-(2,6-pyridinediyldimethylidyne)bis[2-iso-propylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4-chlorocatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[benzenamine]cobalt(I) [3,6-di-tert-butyl-4-chlorocatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4,6-trimethylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4,5-dichlorocatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2-methylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4,5-dichlorocatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-dimethylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4,5-dichlorocatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4-dimethylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4,5-dichlorocatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-di-iso-propylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4,5-dichlorocatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-di-iso-propyl-4-methylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4,5-dichlorocatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-4-methylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4,5-dichlorocatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-6-methylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4,5-dichlorocatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-benzenamine]cobalt(I) [3,6-di-tert-butyl-4,5-dichlorocatecholate], N,N′-(2,6-pyridinediyldimethylidyne)bis[2,4,6-trimethylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4,5-dichlorocatecholate], N,N′-(2,6-pyridinediyldimethylidyne)bis[2-methylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4,5-dichlorocatecholate], N,N′-(2,6-pyridinediyldimethylidyne)bis[2,6-dimethylbenzenamine) cobalt(I) [3,6-di-tert-butyl4,5-dichlorocatecholate], N,N′-(2,6-pyridinediyldimethylidyne)bis[2,4-dimethylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4,5-dichlorocatecholate], N,N′-(2,6-pyridinediyldimethylidyne)bis[2,6-di-iso-propylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4,5-dichlorocatecholate], N,N′-(2,6-pyridinediyldimethylidyne)bis[2,6-di-iso-propyl-4-methylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4,5-dichlorocatecholate], N,N′-(2,6-pyridinediyldimethylidyne)bis[2-iso-propyl-4-methylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4,5-dichlorocatecholate], N,N′-(2,6-pyridinediyldimethylidyne)bis[2-iso-propyl-6-methylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4,5-dichlorocatecholate], N,N′-(2,6-pyridinediyldimethylidyne)bis[2-iso-propylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4,5-dichlorocatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[benzenamine]cobalt(I) [3,6-di-tert-butyl-4,5-dichlorocatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4,6-trimethylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4-methoxycatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2-methylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4-methoxycatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-dimethylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4-methoxycatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4-dimethylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4-methoxycatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-di-iso-propylbenzenamine) cobalt(I) [3,6-di-tert-butyl-4-methoxycatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-di-iso-propyl-4-methylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4-methoxycatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-4-methylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4-methoxycatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-6-methylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4-methoxycatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-benzenamine]cobalt(I) [3,6-di-tert-butyl-4-methoxycatecholate], N,N′-(2,6-pyridinediyldimethylidyne)bis[2,4,6-trimethylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4-methoxycatecholate], N,N′-(2,6-pyridinediyldimethylidyne)bis[2-methylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4-methoxycatecholate], N,N′-(2,6-pyridinediyldimethylidyne)bis[2,6-dimethylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4-methoxycatecholate], N,N′-(2,6-pyridinediyldimethylidyne)bis[2,4-dimethylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4-methoxycatecholate], N,N′-(2,6-pyridinediyldimethylidyne)bis[2,6-di-iso-propylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4-methoxycatecholate], N,N′-(2, 6-pyridinediyldimethylidyne)bis[2,6-di-iso-propyl-4-methylbenzenamine-cobalt(I) [3,6-di-tert-butyl-4-methoxycatecholate], N,N′-(2,6-pyridinediyldimethylidyne)bis[2-iso-propyl-4-methylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4-methoxycatecholate], N,N′-(2,6-pyridinediyldimethylidyne)bis[2-iso-propyl-6-methylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4-methoxycatecholate], N,N′-(2,6-pyridinediyldimethylidyne)bis[2-iso-propylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4-methoxycatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[benzenamine]cobalt(I) [3,6-di-tert-butyl-4-methoxycatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4,6-trimethylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4,5-dimethoxycatecholate), N,N′-(2,6-pyridinediyldiethylidyne)bis[2-methylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4,5-dimethoxycatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-dimethylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4,5-dimethoxycatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4-dimethylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4,5-dimethoxycatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-di-iso-propylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4,5-dimethoxycatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-di-iso-propyl-4-methylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4,5-dimethoxycatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-4-methylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4,5-dimethoxycatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-6-methylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4,5-dimethoxycatecholate), N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-benzenamine]cobalt(I) [3,6-di-tert-butyl-4,5-dimethoxycatecholate], N,N′-(2,6-pyridinediyldimethylidyne)bis[2,4,6-trimethylbenzenamine) cobalt(I) [3,6-di-tert-butyl-4,5-dimethoxycatecholate], N,N′-(2,6-pyridinediyldimethylidyne)bis[2-methylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4,5-dimethoxycatecholate), N,N′-(2,6-pyridinediyldimethylidyne)bis[2,6-dimethylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4,5-dimethoxycatecholate], N,N′-(2,6-pyridinediyldimethylidyne)bis[2,4-dimethylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4,5-dimethoxycatecholate], N,N′-(2,6-pyridinediyldimethylidyne)bis[2,6-di-iso-propylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4,5-dimethoxycatecholate], N,N′-(2,6-pyridinediyldimethylidyne)bis[2,6-di-iso-propyl-4-methylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4,5-dimethoxycatecholate], N,N′-(2,6-pyridinediyldimethylidyne)bis[2-iso-propyl-4-methylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4,5-dimethoxycatecholate], N,N′-(2,6-pyridinediyldimethylidyne)bis[2-iso-propyl-6-methylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4,5-dimethoxycatecholate], N,N′-(2,6-pyridinediyldimethylidyne)bis[2-iso-propylbenzenamine]cobalt(I) [3,6-di-tert-butyl-4,5-dimethoxycatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[benzenamine) cobalt(I) [3,6-di-tert-butyl-4,5-dimethoxycatecholate), N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4,6-trimethylbenzenamine]cobalt(I) [4-iso-propylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2-methylbenzenamine]cobalt(I) [4-iso-propylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-dimethylbenzenamine]cobalt(I) [4-iso-propylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4-dimethylbenzenamine]cobalt(I) [4-iso-propylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-di-iso-propylbenzenamine]cobalt(I) [4-iso-propylcatecholate], N,N′-(2, 6-pyridinediyldiethylidyne)bis[2,6-di-iso-propyl-4-methylbenzenamine]cobalt(I) [4-iso-propylcatecholate), N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-4-methylbenzenamine]cobalt(I) [4-iso-propylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-6-methylbenzenamine]cobalt(I) [⁴-iso-propylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-benzenamine]cobalt(I) [4-iso-propylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4,6-trimethylbenzenamine]cobalt(I) [4,5-di-iso-propylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2-methylbenzenamine]cobalt(I) [4,5-di-iso-propylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-dimethylbenzenamine]cobalt(I) [4,5-di-iso-propylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4-dimethylbenzenamine) cobalt(I) [4,5-di-iso-propylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-di-iso-propylbenzenamine]cobalt(I) [4,5-di-iso-propylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-di-iso-propyl-4-methylbenzenamine]cobalt(I) [4,5-di-iso-propylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-4-methylbenzenamine]cobalt(I) [4,5-di-iso-propylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-6-methylbenzenamine]cobalt(I) [4,5-di-iso-propylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-benzenamine]cobalt(I) [4,5-di-iso-propylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4,6-trimethylbenzenarnine]cobalt(I) [4-cyclohexylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2-methylbenzenamine]cobalt(I) [4-cyclohexylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-dimethylbenzenamine]cobalt(I) [4-cyclohexylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4-dimethylbenzenamine]cobalt(I) [4-cyclohexylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-di-iso-propylbenzenamine]cobalt(I) [4-cyclohexylcatecholate], N,N′-(2, 6-pyridinediyldiethylidyne)bis[2,6-di-iso-propyl-4-methylbenzenamine]cobalt(I) [4-cyclohexylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-4-methylbenzenamine]cobalt(I) [4-cyclohexylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-6-methylbenzenamine]cobalt(I) [4-cyclohexylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-benzenamine]cobalt(I) [4-cyclohexylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4,6-trimethylbenzenamine]cobalt(I) [3,4,6-tri-iso-propylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2-methylbenzenamine]cobalt(I) [3,4,6-tri-iso-propylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-dimethylbenzenamine]cobalt(I) [3,4,6-tri-iso-propylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4-dimethylbenzenamine]cobalt(I) [3,4,6-tri-iso-propylcatecholate), N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-di-iso-propylbenzenamine]cobalt(I) [3,4,6-tri-iso-propylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-di-iso-propyl-4-methylbenzenamine]cobalt(I) [3,4,6-tri-iso-propylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-4-methylbenzenamine]cobalt(I) [3,4,6-tri-iso-propylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-6-methylbenzenamine]cobalt(I) [3,4,6-tri-iso-propylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-benzenamine]cobalt(I) [3,4,6-tri-iso-propylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4,6-trimethylbenzenamine]cobalt(I) [3,6-di-iso-propylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2-methylbenzenamine]cobalt(I) [3,6-di-iso-propylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-dimethylbenzenamine]cobalt(I) [3,6-di-iso-propylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4-dimethylbenzenamine]cobalt(I) [3,6-di-iso-propylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-di-iso-propylbenzenamine]cobalt(I) [3,6-di-iso-propylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-di-iso-propyl-4-methylbenzenamine]cobalt(I) [3,6-di-iso-propylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-4-methylbenzenamine]cobalt(I) [3,6-di-iso-propylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-6-methylbenzenamine]cobalt(I) [3,6-di-iso-propylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-benzenamine]cobalt(I) [3,6-di-iso-propylcatecholate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4,6-trimethylbenzenamine]cobalt(I) [naphthalene-2,3-diolate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2-methylbenzenamine]cobalt(I) [naphthalene-2,3-diolate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-dimethylbenzenamine]cobalt(I) [naphthalene-2,3-diolate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4-dimethylbenzenamine]cobalt(I) [naphthalene-2,3-diolate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-di-iso-propylbenzenamine]cobalt(I) [naphthalene-2,3-diolate], N,N′-(2,6-pyridinediyldiethylidyne)bis(2,6-di-iso-propyl-4-methylbenzenamine]cobalt(I) [naphthalene-2,3-diolate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-4-methylbenzenamine) cobalt(I) [naphthalene-2,3-diolate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-6-methylbenzenamine]cobalt(I) [naphthalene-2,3-diolate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-benzenamine]cobalt(I) [naphthalene-2,3-diolate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4,6-trimethylbenzenamine]cobalt(I) [phenanthrene-9,10-diolate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2-methylbenzenamine]cobalt(I) [phenanthrene-9,10-diolate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-dimethylbenzenamine]cobalt(I) [phenanthrene-9,10-diolate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,4-dimethylbenzenamine]cobalt(I) [phenanthrene-9,10-diolate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2,6-di-iso-propylbenzenamine]cobalt(I) [phenanthrene-9,10-diolate], N,N′-(2, 6-pyridinediyldiethylidyne)bis[2,6-di-iso-propyl-4-methylbenzenamine cobalt(I) [phenanthrene-9,10-diolate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-4-methylbenzenamine]cobalt(I) [phenanthrene-9,10-diolate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-6-methylbenzenamine]cobalt(I) [phenanthrene-9,10-diolate], N,N′-(2,6-pyridinediyldiethylidyne)bis[2-iso-propyl-benzenamine]cobalt(I) [phenanthrene-9,10-diolate], or any of the above compounds where “cobalt(I)” is replaced with platinum(II), palladium(II), nickel(II), iron(II), copper(I), or cobalt(II) and where “nickel(II)” is replaced with platinum(II), palladium(II), cobalt(I), iron(II), copper(I), or cobalt(II).
 16. The compound of any of claims 1 to 13 where X is represented by the formulae:

where each R is, independently, selected from the group consisting of hydrogen, methyl, ethyl, ethenyl, ethynyl and all isomers of propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, nonadecyl, eicosyl, heneicosyl, docosyl, tricosyl, tetracosyl, pentacosyl, hexacosyl, heptacosyl, octacosyl, nonacosyl, triacontyl, propenyl, butenyl, pentenyl, hexenyl, heptenyl, octenyl, nonenyl, decenyl, undecenyl, dodecenyl, tridecenyl, tetradecenyl, pentadecenyl, hexadecenyl, heptadecenyl, octadecenyl, nonadecenyl, eicosenyl, heneicosenyl, docosenyl, tricosenyl, tetracosenyl, pentacosenyl, hexacosenyl, heptacosenyl, octacosenyl, nonacosenyl, triacontenyl, propynyl, butynyl, pentynyl, hexynyl, heptynyl, octynyl, nonynyl, decynyl, undecynyl, dodecynyl, tridecynyl, tetradecynyl, pentadecynyl, hexadecynyl, heptadecynyl, octadecynyl, nonadecynyl, eicosynyl, heneicosynyl, docosynyl, tricosynyl, tetracosynyl, pentacosynyl, hexacosynyl, heptacosynyl, octacosynyl, nonacosynyl, and triacontynyl, phenyl, napthyl, anthracenyl, pyrenyl, biphenyl, benzyl, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, cyclononyl, cyclodecyl, cycloundecyl, cyclododecyl, fluoro, chloro, bromo, iodo, trimethylsilyl, triethylsilyl, tripropylsilyl, dimethylethylsilyl, diethylmethylsilyl, trimethoxysilyl, tirethoxysilyl, tripropoxysilyl, methoxy, ethoxy, propoxy, butoxy, phenoxy, or a nitro, carboxylic acid, ester, ketone (excluding 1,2-diketones) or aldehyde group, provided that two R groups can connect to form substituted or unsubstituted, saturated, partially unsaturated or aromatic ring structures; and each X* is, independently, F, Cl, Br, I, OR**, SR**, NR**₂, PR**₂, or NO₂; and each R* and each R** are, independently, selected from the group consisting of methyl, ethyl, n-propyl, iso-propyl, n-butyl, sec-butyl, tert-butyl, and cyclohexyl.
 17. The compound of claim 16, where R* is tert-butyl or iso-propyl, R** is methyl, and X* is F, Cl, Br or OR**.
 18. The compound of any of claims 1 to 13 where each X is independently selected from the group consisting of ZETA-CATACHOLATES.
 19. The composition of any of claims 1 to 13 where each X is independently selected from the group consisting of THETA-CATACHOLATES.
 20. A catalyst system comprising an activator and the compound of any of the above claims.
 21. The catalyst system of claim 20 wherein the activator comprises an alumoxane and or a modified alumoxane.
 22. The catalyst system of claim 20 wherein the activator comprises methyl alumoxane and or modified methyl alumoxane.
 23. The catalyst system of claim 20 wherein the activator comprises [Me₂PhNH][B(C₆F₅)₄], [Ph₃C][B(C₆F₅)₄], [Me₂PhNH][B((C₆H₃-3,5-(CF₃)₂))₄], [Ph₃C][B((C₆H₃-3,5-(CF₃)₂))₄], [Bu₃NH][BF₄], [NH₄][PF₆], [NH₄][SbF₆], [NH₄][AsF₆], [NH₄][B(C₆H₅)₄], B(C₆F₅)₃ and/or B(C₆H₅)₃.
 24. The catalyst system of claim 20 wherein the activator is an ionic stoichiometric activator compound.
 25. The catalyst system of claim 20 wherein the activator is a neutral stoichiometric activator compound.
 26. The catalyst system of claim 20 wherein the activator is a non-coordinating anion.
 27. The catalyst system of claim 20 wherein the activator is selected from the group consisting of: trimethylammonium tetraphenylborate, triethylammonium tetraphenylborate, tripropylammonium tetraphenylborate, tri(n-butyl)ammonium tetraphenylborate, tri(tert-butyl)ammonium tetraphenylborate, N,N-dimethylanilinium tetraphenylborate, N,N-diethylanilinium tetraphenylborate, N,N-dimethyl-(2,4,6-trimethylanilinium) tetraphenylborate, trimethylammonium tetrakis(pentafluorophenyl)borate, triethylammonium tetrakis(pentafluorophenyl)borate, tripropylammonium tetrakis(pentafluorophenyl)borate, tri(n-butyl)ammonium tetrakis(pentafluorophenyl)borate, tri(sec-butyl)ammonium tetrakis(pentafluorophenyl)borate, N,N-dimethylanilinium tetrakis(pentafluorophenyl)borate, N,N-diethylanilinium tetrakis(pentafluorophenyl)borate, N,N-dimethyl-(2,4,6-trimethylanilinium) tetrakis(pentafluorophenyl)borate, trimethylammonium tetrakis-(2,3,4,6-tetrafluorophenyl)borate, triethylammonium tetrakis-(2,3,4,6-tetrafluorophenyl)borate, tripropylammonium tetrakis-(2,3,4,6-tetrafluorophenyl)borate, tri(n-butyl)ammonium tetrakis-(2,3,4,6-tetrafluorophenyl)borate, dimethyl(tert-butyl)ammonium tetrakis-(2,3,4,6-tetrafluorophenyl)borate, N,N-dimethylanilinium tetrakis-(2,3,4,6-tetrafluorophenyl)borate, N,N-diethylanilinium tetrakis-(2,3,4,6-tetrafluorophenyl)borate, N,N-dimethyl-(2,4,6-trimethylanilinium)tetrakis-(2,3,4,6-tetrafluorophenyl)borate, trimethylammonium tetrakis(perfluoronaphthyl)borate, triethylammonium tetrakis(perfluoronaphthyl)borate, tripropylammonium tetrakis(perfluoronaphthyl)borate, tri(n-butyl)ammonium tetrakis(perfluoronaphthyl)borate, tri(tert-butyl)ammonium tetrakis(perfluoronaphthyl)borate, N,N-dimethylanilinium tetrakis(perfluoronaphthyl)borate, N,N-diethylanilinium tetrakis(perfluoronaphthyl)borate, N,N-dimethyl-(2,4,6-trimethylanilinium)tetrakis(perfluoronaphthyl)borate, trimethylammonium tetrakis(perfluorobiphenyl)borate, triethylammonium tetrakis(perfluorobiphenyl)borate, tripropylammonium tetrakis(perfluorobiphenyl)borate, tri(n-butyl)ammonium tetrakis(perfluorobiphenyl)borate, tri(tert-butyl)ammonium tetrakis(perfluorobiphenyl)borate, N,N-dimethylanilinium tetrakis(perfluorobiphenyl)borate, N,N-diethylanilinium tetrakis(perfluorobiphenyl)borate, N,N-dimethyl-(2,4,6-trimethylanilinium)tetrakis(perfluorobiphenyl)borate, trimethylammonium tetrakis(3,5-bis(trifluoromethyl)phenyl)borate, triethylammonium tetrakis(3,5-bis(trifluoromethyl)phenyl)borate, tripropylammonium tetrakis(3,5-bis(trifluoromethyl)phenyl)borate, tri(n-butyl)ammonium tetrakis(3,5-bis(trifluoromethyl)phenyl)borate, tri(tert-butyl)ammonium tetrakis(3,5-bis(trifluoromethyl)phenyl)borate, N,N-dimethylanilinium tetrakis(3,5-bis(trifluoromethyl)phenyl)borate, N,N-diethylanilinium tetrakis(3,5-bis(trifluoromethyl)phenyl)borate, N,N-dimethyl-(2,4,6-trimethylanilinium)tetrakis(3,5-bis(trifluoromethyl)phenyl)borate, di-(iso-propyl)ammonium tetrakis(pentafluorophenyl)borate, and dicyclohexylammonium tetrakis(pentafluorophenyl)borate, tri(o-tolyl)phosphonium tetrakis(pentafluorophenyl)borate, tri(2,6-dimethylphenyl)phosphonium tetrakis(pentafluorophenyl)borate, tropillium tetraphenylborate, triphenylcarbenium tetraphenylborate, triphenylphosphonium tetraphenylborate, triethylsilylium tetraphenylborate, benzene(diazonium)tetraphenylborate, tropillium tetrakis(pentafluorophenyl)borate, triphenylcarbenium tetrakis(pentafluorophenyl)borate, triphenylphosphonium tetrakis(pentafluorophenyl)borate, triethylsilylium tetrakis(pentafluorophenyl)borate, benzene(diazonium) tetrakis(pentafluorophenyl)borate, tropillium tetrakis-(2,3,4,6-tetrafluorophenyl)borate, triphenylcarbenium tetrakis-(2,3,4,6-tetrafluorophenyl)borate, triphenylphosphonium tetrakis-(2,3,4,6-tetrafluorophenyl)borate, triethylsilylium tetrakis-(2,3,4,6-tetrafluorophenyl)borate, benzene(diazonium) tetrakis-(2,3,4,6-tetrafluorophenyl)borate, tropillium tetrakis(perfluoronaphthyl)borate, triphenylcarbenium tetrakis(perfluoronaphthyl)borate, triphenylphosphonium tetrakis(perfluoronaphthyl)borate, triethylsilylium tetrakis(perfluoronaphthyl)borate, benzene(diazonium)tetrakis(perfluoronaphthyl)borate, tropillium tetrakis(perfluorobiphenyl)borate, triphenylcarbenium tetrakis(perfluorobiphenyl)borate, triphenylphosphonium tetrakis(perfluorobiphenyl)borate, triethylsilylium tetrakis(perfluorobiphenyl)borate, benzene(diazonium)tetrakis(perfluorobiphenyl)borate, tropillium tetrakis(3,5-bis(trifluoromethyl)phenyl)borate, triphenylcarbenium tetrakis(3,5-bis(trifluoromethyl)phenyl)borate, triphenylphosphonium tetrakis(3,5-bis(trifluoromethyl)phenyl)borate, triethylsilylium tetrakis(3,5-bis(trifluoromethyl)phenyl)borate, and benzene(diazonium) tetrakis(3,5-bis(trifluoromethyl)phenyl)borate.
 28. The catalyst system of any of claim 20 to 27 further comprising a co-activator.
 29. A composition comprising a compound of any of claims 1 to 19 and a support.
 30. A composition comprising a catalyst system of any of claims 20 to 28 and a support.
 31. The composition of claim 29 or 30 where the support comprises one or more Group-2,-3,-4,-5,-13, or -14 metal or metalloid oxides.
 32. The composition of claim 29 or 30 where the support comprises silica, alumina, silica-alumina, or mixtures thereof.
 33. The composition of claim 29 or 30 where the support is silica.
 34. A method to polymerize an unsaturated monomer comprising contacting the monomer with the catalyst system of any of claims 20 to
 28. 35. A method to polymerize an unsaturated monomer comprising contacting the monomer with the composition of any of claims 30 to
 34. 36. A method to oligomerize an unsaturated monomer comprising contacting the monomer with the catalyst system of any of claims 20 to
 28. 37. A method to oligomerize an unsaturated monomer comprising contacting the monomer with the composition of any of claims 30 to
 34. 38. The method of any of claims 34 to 37 where the monomer comprises one or more C₂ to C₁₀₀ olefins.
 39. The method of any of claims 34 to 37 where the monomer comprises one or more of ethylene, propylene, butene, pentene, hexene, heptene, octene, nonene, decene, dodecene, 4-methylpentene-1,3-methylpentene-1,3,5,5-trimethylhexene-1, and 5-ethylnonene-1.
 40. The method of any of claims 34 to 38 where the monomer comprises ethylene.
 41. The method of any of claims 34 to 38 where the monomer comprises propylene.
 42. The transition metal compound of any of claims 1 and 5-19 wherein M is nickel, the compound is dimagnetic and the coordination sphere of the compound is arranged in a square planar geometry.
 43. The compound of claim 1, 2, 3, or 4 wherein is L is selected from the group consisting of IOTA-LIGANDS.
 44. A catalyst system comprising the compound of claim 42 or 43, an activator and an optional support.
 45. A method to oligomerize or polymerize an unsaturated monomer comprising contacting the monomer with the catalyst system of claim
 44. 46. The method of any of claims 34, 35, 36, 37, 38, 39, 40, 41 or 45 wherein the monomer comprises one or more norbornenes, substituted norbornenes, cyclopentadienyls or substituted cyclopentene. 